Underground Dipole - the COLLAPSE of my ideas of Ham Antennas

Help me to understand. I planned this test as a joke, but it turned out serious. Successful QSOs on an antenna that is invisible and buried in the sand!! And this - on the day with bad propagation because of magnetic storm. To get an SWR 1.4 on 14.200 MHz I had to shorten the antenna in half! And it worked still well even with DX Stations from Siberia. Dear hams, how is this possible?
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My personal webpage: Raisa.blog
My other social media with Ham content:
/ ylraisa
/ ylraisa
73 and see you On the Air!
YL Raisa
#r1big
#hamradio
#oh7bg

[@TheREALJosephTurner]

I love how you're not afraid to try unusual setups! Your videos are amazing and fun. Keep up the great work, and I'll keep watching!

[@YLRaisa]

Thanks. I enjoy the radio and it's promotion 😃

[@N1IA-4]

Glad to see a ham not afraid to think outside of the box! I just put a 200' longwire on a 6' wooden fence, with a 100' counterpoise near the bottom of the fence here in Florida. It is much quieter than a vertical on receive and is a good NVIS antenna. Congrats on your QSOs, Raisa.

[@johnwest7993]

When I was living in Michigan I unds of 8 gauge wire on it, added a big air-variable capacitor to make it a high Q tuned circuit, and a FET pre-amp in order to receive WWVB on 60 kHz from Colorado, a distance of 1,000 miles away. I moved the loop from my first floor shop to the roof but found that the signal to noise ratio got worse there than in my shop. I finally tried it in the old, unfinished (mostly dirt floor) basement and ran coax up the stairs to my shop. Beautiful signal, almost pure sinusoidal except for a bit of noise on it for an hour or so at dawn and sunset. It occurred to me that the basement, which had only 1 lightbulb screwed to a rafter, and no other AC wiring was the lowest noise location around. RF noise was being suppressed, but the miles-long 60 kHz signals from Colorado didn't care about a little dirt.

[@49Mack]

Raisa, you're amazing!! You are like an online teacher for our hobby!! Please keep those experiments coming!! We're taking notes, for sure!! Thank you, and see you soon!! 73 & 88!!

[@YLRaisa]

😂 thanks Phil 73&88

[@digitalmediafan]

Fascinating and fun to watch, being near the sea must be a help of course. I've never seen any ham or YL get so excited as you 😊 Lovely beach

[@YLRaisa]

I love our hobby ❤

[@ronwolenski-n8wcr]

Everyone - Put your antenna as high as you can. Raisa - I'm going to bury my antenna! LOL Keep experimenting, not everyone is right! 73!

[@YLRaisa]

😂 It's me😅

[@clems6989]

Russia : Hold my beer....

[@HannoBehrens]

The dry sand doesn't give much HF resistance, for it's mostly silicon. It shortens it a bit, but that's it. You are at the sea or at a lake and with that you have a very good groundplane beneath your antenna, which will reflect the signal high. My theory is, if you put your antenna in wet soil somewhere on the country, your results will be not as good. Excellent experiment! We had a very noisy 20m yesterday, so I'm quite surprised. I learned something today. 73 de DL7HH

[@johnwest7993]

Yep. Conductive ground will ground it right out, but sand, especially if it's dry, hardly conducts anything at all, so RF hardly even sees it. An important element in designing a good ground for an image plane reflector out here in Colorado is figuring out just where the bands of interest 'think' ground actually is beneath your antenna, because it will be below actual ground level some distance. Underground antennas are good for getting rid of noise if you are working at very long wavelengths, although just setting the wire out on top of the ground is usually good enough.

[@Redbelly357]

Awaiting you wet soil video.

[@peter837southjerseycbradio]

Hi, my name is Peter and I live in New Jersey USA I am working on getting my license. I have watched many of your videos, but this video is pretty cool, I love experiments. You did a fantastic job, well done.😊

[@la3dna]

I did a similar experiment years ago with a 20m dipole, I didn't bury it but left it uncovered on the ground surface. SWR was a little high but I worked several contacts in to central and south Europe. When propagation is good you can use almost anything as an antenna of course with reduced efficiency. Anyway nice to do some crazy experiments.😀

[@YLRaisa]

You are right. The most important thing is good propagation 🤗

[@dxscotland5901]

Wow !! I have a Rx loop about 1 inch under ground but never tried a tx antenna buried! Well done Raisa

[@YLRaisa]

You can try 😂

[@mxlion]

This is why they call it the license to learn! Always keep experimenting!

[@raysoucie489]

Thanks for the KOOL experiment!!! When I worked as a Radar Engineer, my Boss allowed me to do many experiments !!! I failed over 1,000 times,as my former Employer expected yet,I had a few GEMS that made money for that Company..... K40 Electronics is STILL going strong!!!

[@YLRaisa]

TNX comment! ... and what is your Call now? Raisa

[@raysoucie489]

@@YLRaisa KE0DNQ

[@josephcooksley3219]

Very interesting experiment and great result using water table as a reflector element

[@YLRaisa]

Thanks for watching 👀 🙂

[@ve3pcp]

Another awesome video my friend! Keep up with the experiments! Too many people are happy just to sit in their shac k and never get out to do things and experiment! Very proud of you! 🥰

[@YLRaisa]

😊

[@raydavidsonm0ray.777]

Hi Raisa, I am gobsmacked, flabbergasted, really surprised at this. I've never heard of doing anything like this before, and my favourite subject in Amateur Radio is experimenting with antennas. Congratulations Raisa on your successful contacts. De Ray, M0RAY, South East England, UK. XX

[@YLRaisa]

Ray, I remember you call! 😉 I am glad my experiment could surprise you😁

[@turtlekoff1]

I love this video Raisa and your enthuiasm is so nice to see. I am going to have to try this on my beach here in Florida. 73 and keep up the good work !

[@YLRaisa]

Please share the result of your experiment with me 😉. Good luck 👍

[@terrymefford697]

Comrade Raisia excellent video on vintage Soviet practice. 73s Terry N8WEL l

[@ldytb]

I told AI (Chat GPT Version 4) about your experiment. Here is the response. Your ham radio experiment at the beach has a fascinating result and is tied to several key principles of radio wave propagation and antenna theory. Let's dig into this: Antenna Near Ground: The performance and behavior of an antenna can be significantly influenced by its proximity to the ground (or in this case, sand). This influence includes changes in radiation pattern, impedance, and resonant frequency. In this case, the sand was effectively part of the ground. Impact of Soil (or Sand) Characteristics: Different ground types (sand, soil, rock, etc.) have different electrical properties, including conductivity and dielectric constant. In general, wet or salty environments like the beach are more conductive than dry or rocky ones. The higher conductivity can effectively 'slow down' the radio waves, causing the antenna to behave as if it's longer than it physically is. This is why you had to shorten your antenna to reach resonance; the conductive sand was making your antenna electrically longer. Ground-Image Effect: When an antenna is placed close to the ground, it generates an 'image' of itself in the ground, effectively creating a mirror image. For a dipole, this can make it behave as if it's a part of a larger antenna system, changing its radiation pattern and potentially improving its performance. Proximity to Sea Water: If your beach is close to the sea, it's worth noting that sea water is a fantastic conductor. The combination of the ground effects mentioned above and the proximity to the sea could result in improved antenna performance, especially at lower frequencies. Burying the Antenna: Burying the antenna might also lead to some interesting effects. When you bury an antenna, you can form a ground dipole, a type of antenna that works by transmitting through the earth itself. In some circumstances, this can result in surprisingly effective communications. All these factors could be at play, leading to the outcomes of your experiment. It's a good demonstration of how complex and fascinating radio wave propagation can be, and how different environments can dramatically impact radio communications.

[@subramanianr7206]

Raisa has nothing to comment on. I don't have anything to say either. De VU2RZA

[@etzow]

All the theory is nice and worth mentioning. However, there is no real fun in reading alone in contrast to actually practically take the wire and go on the air. Well done, Raisa! 👌

[@xe1fbg]

Escuché tu entrevista en CQ en Frecuencia, saludos 73.

[@YLRaisa]

Thanks. It was nice talk with Xavi.

[@simontemplar0468]

AWESOME!!! Great idea. It works. Love it. Great to see you "sis". Have a great weekend. *Hugs*

[@lauriew2907]

Love what you do with amateur radio Raisa…I’m learning a lot from you.

[@YLRaisa]

Thanks. I am very glad it's useful for you 😀

[@Patrick_PD2ET]

Muahhah Fatastic expirement layd Raisa ..and thank you for our second contact ..im always happy to hear you ciao 7351's Patrick

[@YLRaisa]

Patrick, thanks to you too 👍

[@py3tam]

My congratulations Raisa for the experiment, I didn't think it would stop much less make contact,,,,, a strong 73😀

[@YLRaisa]

Thank you

[@bassmanjr100]

Probably the sand is dry and simply acts like an insulator. If it was wet, it would be like surrounding the antenna with a grounded conductive material. Just some initial thoughts.

[@YLRaisa]

thanks for sharing your thoughts 👍

[@chrisjohnson8741]

I imagine that some distance below the antenna is salt water wetted sand, acting as a very good ground plane. I think what this amounts to is a NVIS antenna. It's a neat trick anyway, and might be really useful if you need an unobtrusive antenna in the field.

[@andy2E0JIU]

Fantastic work raisa!!! Hope you are well 73

[@2321brendan]

Hahaha. This is Gold.👍👍 Maybe try another antenna for rx up the other end of the beach?see how much signal is absorbed? would like to see results in nice black soil too!

[@russellroberts2228]

Just a quick note. I laid a 40 meter dipole antenna directly on the ground (10.06 meters each element). The antenna works well as a NVIS (Near Vertical Incidence Skywave) antenna. I've also used what is called a "grasswire antenna" for DX. Please see articles by Tom Toia (K3MT). This antenna is very quiet on receive and does well if you point it toward your favored direction. Your videos are a joy to watch. Aloha from Hawaii Island. Russ (KH6JRM).

[@YLRaisa]

Yes, NVIS... but I also did DX QSO with an On the Ground ANT, 73! Raisa

[@jean-marcparatte5564]

@@YLRaisa what can you say about direction of antenna, is traffic longitudinal (I think so) or perpendicular to dipole?

[@361cctx-vv6ch]

Omg your just like me when it comes to radio and making antennas, I also make my own antennas and I experiment with my antennas all the time and i only listen to what the swr tells me not what other people say. I got contacts on my home made dipole only 3 ft off the ground. I am planning a trip to beach as well to experiment with burying the dipole. Awesome test keep experimenting. I’m definitely subscribing. 73 de Corpus Christi Texas

[@YLRaisa]

It's great that we are similar in our interests. Then share with me here how the experiment with the buried antenna went.

[@361cctx-vv6ch]

@@YLRaisa i will def share with you when i make the underground antenna, my car blew its engine so i have to install a new engine so i can make it to the beach. thank you for the replay, only testing i have done so far on my dipole is mount it 2-3 ft off the ground to see what happens, which did give me 1.02:1 swr and a contact to queensland Australia. 73s de corpus christi texas

[@Francois_Dupont]

this is very strange result as always i am very impressed. thank you for always making such interesting experiments!

[@YLRaisa]

Hi Francois, I am happy that you liked it :-)

[@accountant1653]

Раиса, вы такая милая и симпатичная, что тяжело сосредоточиться на технических вопросах вашего ролика!😆

[@YLRaisa]

спасибо за комплимент ;-) 73, Раиса

[@M0YKSHamRadio]

Thanks for the fun experiment. Wow what a result! 🎉 Hope to catch you next time 73 88 good DX

[@antoniorodrigues6175]

Wow,Raisa,very good antenna and equipaments! Congratulations from Brazil!! 73!!

[@YLRaisa]

Tnx, see you on the air!

[@DK5ONV]

Fantastic Job, Raisa. All the good radiating Waves with the big Signals coming from the Underground. 73 de Uncle Günter 💯👌

[@gregmihran8616]

Nice Job Raisa! I would be willing to bet that your success was assisted with your proximity to that body of water - I assume that's a sea and it's full of SALT - a magnificent RF conductor. I wonder what would happen if you buried it in your backyard 😀73 KJ6ER, Silicon Valley

[@YLRaisa]

You'll see soon ;) And you will be surprised!

[@davidvanhorn498]

The dielectric constant of the material surrounding the antenna changes the length for resonance. Having an above ground antenna to do A-B compares would be a good idea. HF propagation changes significantly over time.

[@robertaldrich2635]

I have read that early experimenters also used trees as antennas, one guy put a nail in a tree halfway up and got on the aur just fine! Other early experimenters also discovered how to bury an antenna and communicate with uderground waves of some sort. And no noise!

[@LB6QJ]

This is very very cool, i was not aware of you could do it. I was told it had to be as hight as possible. 73 de LB6QJ

[@YLRaisa]

It should be for good result, but it work the other way too 😉

[@brucewinningham4959]

YL Raisa is a Great Radio Scientist. I Love your Videos. You are such a Great Teacher. ❤

[@YLRaisa]

😆 thanks Bruce

[@dandypoint]

The velocity factor for an antenna wire above the ground is maybe 95%. As the wire gets very close to the ground the velocity factor goes down to maybe 60 or 70% on the ground. I experimented with and use several Beverage on the ground receiving antennas. Using my measured 60% (which is probably close in many cases ) you would find a half-wave dipole for 20 meters would need to be only about 5 meters long instead of about 10 meters. That’s exactly what you discovered in your experiment on the beach! Additionally most radio waves penetrate the earth to some degree. The shorter the wavelength the less it penetrates. 73, N4DJ

[@YLRaisa]

yes, we have the same result: 5 meters long instead of about 10 meters, regardless if in the USA or Russia.. 73! Raisa

[@TR6Telos]

I'm off to the abandoned coal mines with a pocket full of wire to do some serious DXing! Brilliant Raisa!

[@delmarbish3926]

Never dreamed it would work! You seem to have so much fun with HAM radio, love your videos. 73s KC5HHB

[@YLRaisa]

Thanks, yes I like experimenting and will continue ;-) 73, Raisa

[@Patrick-rd9qo]

Very entertaining! I wonder if your signal is getting reflected off the water, be interesting to try again but more inland.

[@YLRaisa]

I have already carried out such an experiment far from the water and soon you will see the result. If you are subscribed to my channel? ;)

[@vetham100]

That was an amazing experiment and may I say, you are exceedingly creative knowledgeable and pretty! Thank you for a great video. 73

[@YLRaisa]

☺ tnx

[@robertmeyer4744]

That was great. I have the same antenna analyzer just has UHF. HF signals are longer wavelength. and for DX they have low angel off the horizon. you can even use a whole wavelength of wire in a big square using a 4:1 balun . lay it right on the ground and it will work great. DX commander has a 80 meter loop just less than a meter off the ground and it works great. once you get into 160 meters the signal just rides along the ground. happy to see you trying different things, this is the fun of HAM radio. for DX on HF the takeoff angle is about 3 to 8 degrees off the horizon. depending on band. I am in Boston NY,USA . during winter in a park on the air we just threw out wire to make a 160 meter di pole . worked stations all over even AM contacts with a icom IC 7300 and a battery. 73's

[@YLRaisa]

Thanks for a detailed comment! I hope we see each other on the band soon! 73! Raisa

[@georgegetterdone896]

Ihave seen 10-11 meter operators do same with extended ground radials buried three to five inches deep and multiple from vertical hub then watering the wires ,after watering the wires there was significsnt gain communication started at 100 air miles 1S unit at 1/2. Wave antron 99 after water injected the sig increased to 3S unit same mileage same antron 99

[@YLRaisa]

Thanks for sharing with my and my audience results of this experiment.

[@josemanuelperezrodriguez-hm8vw]

IM Crazy O My God Amazing 👏👏👏👍👍👍Thank for sharing Raisa 💖💖💖

[@YLRaisa]

:)

[@mariofachinsky5639]

Greetings from Buenos Aires, Argentina Raisa... This is not an underground antenna, its an underdrysand antena... your next experiment should be trying this same setup in a more average inland soil, considering moisture, grass, etc... and buried half a meter or so to really find out what a real underground antenna performance is... that would be very interesting to see. Great video, 73!!! from LU2AW

[@TomA-qy6jz]

Very nice test Raisa. I did something similar a few days ago. I was on a mountaintrip and on my destination 440 m asl I laid an 80-10 efhw directly on the mountain. I tuned it with my Elecraft T1 tuner and made QSO with my FT817 with 5 watts. It seems that if what is under the antenna has poor ground it will work.

[@ARDFsport]

Raisa was on the shoreline, so, just some meters to the salt water... still worked...

[@YLRaisa]

great experiment. In some situations, this understanding can help!

[@terrymefford697]

Excellent UG antenna tovarich Raisia R1BIG

[@winstonchurchill6506]

Well done enjoy the sun as well.cheers uk

[@YLRaisa]

TNX!

[@F4EPU]

Good job Raisa 👍

[@YLRaisa]

Tnx David

[@andch.6659]

Замечательный эксперимент, Раиса!!! 👍👍👍😊😊😊

[@YLRaisa]

Спасибо :)

[@evgeniybahtinov5838]

Раиса, приветствую! Отличное видео! Эксперимент удачный! Наличие открытого водного пространства (море, река, озеро) только усилит эффект. Есть антенна LOG (loop on ground) или рамка на земле - посмотрите в интернете - это тоже работает но я использовал только на приём . P.S - подземные антенны существуют и работают но размер футбольного поля 😅 . С уважением , Евгений R3DBB, 73!

[@YLRaisa]

Евгений, большое спасибо за ответ. Обязательно посмотрю!

[@a2phil]

Already have the coax underground...now to talk the XYL into it!!!

[@YLRaisa]

LOL :)

[@forgetyourlife]

I heard some over the horizon radar and one ionosonde during that 1st qso.

[@YLRaisa]

Great!

[@youtube.youtube.01]

It has been known for years that most radiation signal enamates from the antenna tips. If your tip was exposed, that was where most of your signal was captured and escaped.

[@CWChirpyWire]

very well known for years, even an american patent cica 1924 or so exists ! And further more, dry sand is like "glass" ... very good isolator ! so your antenna is at the height of the thickness of the sand layer !

[@hablalabiblia]

Great video! Loved your energy! Following!

[@YLRaisa]

Thanks. You are welcome to my channel 😀

[@metalhalokj7vzy164]

That's really cool how you did that in the sand and how good it works😎

[@qsobrasil9269]

hello Raisa . all right friend , never imagined that could work an underground antenna. I'm surprised at the yield . 73 Raisa At Roberto PU2TWZ

[@alexanderkalender765]

I was also surprised, I planned it as a Joke ;-)

[@walteredwards544]

You are next to the ocean so the salt water is in the ground below you. That gives your antenna more reflective power. It looks like you are getting good NVIS. I didn't notice if you could do DX though but I'm guessing not so much. Enjoy and 73's KN4MXZ

[@alexanderkalender765]

She wrote on Russian that she could get dx from Siberia 5000 km..

[@YLRaisa]

Yes I had some DX stations :)

[@russellroberts2228]

Fascinating experient, Raisa. Most of my underground antennas have been used for receiving only...I must try this idea. Thanks for sharing....Aloha, Russ (KH6JRM).

[@YLRaisa]

Hi! please tell me your results ;-) 73! Raisa

[@pipespb]

Засыпать сухим песком - это ещё не "подземная" ;-) Но уже на высоте подвеса, стремящейся к нулю... 73!

[@YLRaisa]

;)

[@tmharry]

Thanks for the very interesting video. Could you tell us about what inspired you to try this method ?

[@M7BVV-Phil]

Mind blown!🤯

[@miroslavzoubek6037]

It is a very beatiful experiment, I like to watch your videos,Hope to have a contacts with you a next time😉😉😉Bey from Czech republic🙂🙂🙂

[@YLRaisa]

see you on the Air!

[@miroslavzoubek6037]

See you too on air, have a good time,bey Raisa 😉😉😉

[@nooramamat4462]

Good experiment in dry sand 👍...73

[@YLRaisa]

Thanks

[@deanmason560]

So how many foldbacks are on the antenna. What is the dipoles total length? Thanks AF6MC

[@YLRaisa]

Hi! It was shortened almost two times compared with normal high dipole... It depends on the soil! So it will always be different lenghs...73! Raisa

[@robertgarland9342]

Well Raisa I think you have disproved the theory that Height is might. I wish I could understand why the antenna worked so well underground. Keep up to good work with your Ham radio experiments. I love watching your videos. Looking forward to the next one.

[@YLRaisa]

Thanks Robert 😃

[@r3tm362]

Нет слов! Классный эксперимент результат!👍 Кому ещё такое в голову придет😊 Партизанская антенна😂 В следующий раз можно ещё глубже закопать... А можно сравнить с такой же антенной, но подвешенной.

[@YLRaisa]

Прям мысли мои прочитала. Следующий ролик будет как раз об этом ;). Спасибо, Маша. Ты на следующей неделе будешь в эфире? Я в Карелию еду, буду переодически и разных мест работать и впервые использовать tnxqso сайт :) Буду очень рада встретить в эфире, раз в Питере в этом году не удалось :)

[@alexanderkalender765]

или с диполем, концы которого держат Раиса и Мария

[@YLRaisa]

@@alexanderkalender765

[@r3tm362]

@@YLRaisa в следующие выходные будет шанс включиться☺️ поедем в деревню. Три недели не ездила... Буду следить!

[@YLRaisa]

@@r3tm362 В выходные постараюсь выйти только ради тебя 😘

[@ON3STG]

Hi Raisa nice video and I like seeing you experiment. In my opinion it's the sea nearby that influences your result a lot. It's salt water and will help the waves getting. Maybe good idea to do the same test further away from the sea to see if there's any difference. 73 Gert ON3STG

[@dsolo3250]

The reason it works is because you are actually sleeping. Everything you know and experience is a dream where anything is possible

[@deankq4adj125]

Very interesting, thanks for sharing. Just excellent!

[@matthiaswilhelm9813]

Earth Antenne?why Not!a old Experiment.

[@WECB640]

Answer: "Oh oh oh it's magic, you know. NEVER believe it's not so!" Raisa, I believe that because the antenna is in dry sand, that sand is invisible to the RF. Only the water below can be the reflector, so it's as though the dipole is NVIS. The water is salty so it is acting as a near perfect reflector but it also has the effect of adding capacitance in parallel with the dipole, thus making it ELECTRICALLY longer than normal, so you had to cut it back to bring it back to resonance. I seem to recall many of the armed forces using just such a buried dipole in the sand. I will not work in normal soil because the moisture effectivly shorts it out at RF, but in very arid sand (like the Sahara desert) it works in a pinch and can not be seen. Keep up the great work Raisa. 73

[@YLRaisa]

thanks for explanation! 73!

[@ronki5gnl689]

Would like to see some ft8 and a psk reporter map. I might try it at galveston state park

[@YLRaisa]

yes, it would make sense, but I am not aware of this service, I have to learn more about it, 73, Raisa

[@ronki5gnl689]

Then click on map

[@CQenFrecuencia-Radioaficion]

¡Incredible Raisa! Good job. I think...¿What may happen if you try it far from the sea? It will be other good experiment...

[@YLRaisa]

You will see soon!

[@wesKEVQJ]

Some home owner association will still find a way to put an end to this malarkey. I bet if you put enough watts into it in a yard worms would jump out of the ground.

[@YLRaisa]

LOL :)

[@gregrush6570]

I think your propagation radiance has more to do with your radiant personality! Smiley 73's!

[@YLRaisa]

what a compliment ;-) thank you! Raisa

[@DC-gv4cw]

Amasing experience ! On which band did you have the QSO ? Is it a beach on the sea or on a lake ? (salted water ?) Thanks for your videos. 73/88 📻😀

[@YLRaisa]

20 m , beach of sea, with very small %% of salt water (Finnish gulf)

[@DC-gv4cw]

Ok, I was wondering if it was not the Ladoga lake. 73/88😊@@YLRaisa

[@w8lvradio]

Dear Raisa, Refraction "tilt", much as in a "Beverage" antenna. I have seen some other work along these lines, as I recall, an antenna was placed in the ground in a trench, the trench was filled with styrofoam beads. Silica should act in a similar way, with some losses from any iron contained in the sand. How many metres long was the overall length of your dipole? 73 DE W8LV BILL

[@okhamradio]

😊 It's really interesting experience to work with the underground antenna

[@YLRaisa]

tnx 😄

[@k1zmt]

Technically there is nothing wrong with that antenna. First of all, you have been burying the dipole in the dry sand which is quite good dielectric. This results in a capacitive load which explains why you had to shorten the dipole. It would be interesting to bury the triangle antenna. Triangle antenna forms a stronger magnetic field which is supposed to be less adsorbed by the ground. So, what is next, Raisa? Are you going to sink the antenna or lift on a balloon?

[@RC-Heli835]

What have you done Raisa just bury a loop antenna?

[@timdbl7804]

Excellent and fun!!😊

[@PY5270SWL]

Very good Raisa. Success. A strong 73 from PY5270SWL.

[@YLRaisa]

Thanks. Good luck!

[@samuelwhittemore7675]

Since this is an NVIS application what kind of balun are you using?

[@YLRaisa]

it was a standard balun and standard dipole for 20 m, which I had to shorten a lot.

[@samuelwhittemore7675]

@@YLRaisa very cool and thank you for replying!

[@ingussilins6330]

Paldies, ka uzturat "dzīvu ideju" par pazemes elektrodu antenām! Jau 1920 gados visi slavēja šo brīnumantenu. Mazāk trokšņu, statisko izlāžu sprakšķu, spēcīgāki signāli un nav redzama. Vari paeksperimentēt ar balss parraidi ( audiosignāls ) tieši uz iezemēto elektrodu antenu.

[@sanjithnair3266]

Hi Reza, I'm VE7JAI Sanjith. You're doing a very good test. I'm very curious to know more about this, how many watts of power you're transmitting

[@YLRaisa]

I am Raisa and I transmitted 100 W 😀. Thanks Sanjith

[@jimfaria2]

Fantastic!!!!

[@tonypino2858]

Leuk Expiriemend met de Underground Antenne

[@YLRaisa]

tnx

[@tonypino2858]

@@YLRaisa Geen dank en groetten vanuit Holland

[@janformolo7132]

The seceret isn't a seceret. Look at the background to the ocean. It is water with free soltved ions of salt in it. These are good conditions for spreading the HF waves. By the way the "Goliath" use the same effect. Please put the antenna in the air. I'm sure you need more logbooks capacity. To recomend is the butternut antenna for your location on the beach on the ocean. Or try a tripple leg. Vy 73 de Jan, DL9MGE

[@YLRaisa]

Hi Jan, TNX for your comment, I already made the same test in the forest, NOT near alt water and I will publish the video with results soon ;-)

[@dpinkerton7441]

Hello , this is very interesting, can to tell us if you are near fresh or salt water 73

[@stefanrudorfer4317]

Unbelievable, i never hear about it to put the antenna in the underground. But it is function why not. 73 DL1STJ

[@YLRaisa]

It is clear that a suspended antenna will work better. My experiment shows that even a buried antenna can help you to make QSO. :)

[@erpece]

Great experiment with amazing results!! Is this a salt water environment? That would help...

[@YLRaisa]

only very little salt was this water. I already made the same test in the forest, NOT near alt water and I will publish the video with results soon ;-)

[@erpece]

@@YLRaisa Looking forward to that!

[@Steve-GM0HUU]

Interesting. The distances for the contacts in video were maybe 1000 to 2000km. This suggests antenna was not working in purely NVIS mode? The sand did look quite dry which may have been a factor?

[@YLRaisa]

I did also QSO with more than 5000 km with UA0 (Siberia). It was just not recorded... So it worked also for DX ! 73! Raisa

[@MI7DJT]

Another excellent and confusing experiment Raisa lol. Keep 'em coming :)

[@YLRaisa]

thanks Eamon 😊

[@bergfunkstation]

hello Raisa, interesting your antenna tests, the CB mountain radio operators in the Black Forest Southwest Germany send you many greetings 55/73 🙂📡

[@YLRaisa]

Thanks for CB-greetings ;-)

[@maxastuto]

very good Raisa!!!! i'm Massimiliano IU8MLV '73

[@YLRaisa]

Hi Massimiliano 👋

[@Dromidont]

Любопытно... 🤔 Надо бы попробовать при случае... 🙄

[@YLRaisa]

Потом, поделитесь результатом :)

[@Dromidont]

@@YLRaisa Обязательно.