Have a look at vk6ysf.com/yagi_J_Driven_Element_20250715.html

Thanks! As you pointed out, this measurement is not as straightforward as it might seem, and multi-path reflections, as you mentioned, are indeed a challenge. My initial attempts involved placing the antennas much farther apart, which caused significant issues with reflected signal paths. The advice I received was to position the antennas as close as possible to mitigate the effects of reflections. The separation distance needs to be beyond the induction field, which is dominant only out to about half a wavelength (from memory), and ideally around 2 to 3 wavelengths. In this instance, I positioned them at 3 wavelengths, or about 2 meters apart. I'm still of the view that greater separation would yield better results. I plan to use bow-tie antennas, which are directional and can reduce nuisance reflections while providing predictable gain if constructed well. I also intend to take measurements higher above the ground to further improve accuracy. That said, I think there are far too many claims about antenna performance on the internet that aren't well-supported. This is my attempt to raise the standard. Watch this space-there’s more to come! Any advice or constructive criticism is most welcome.

I probably shouldn't say this without measuring it, but based on experience, the loss increases quite sharply as you approach 90 degrees, while there is only a very modest loss at 45 degrees.

@@petermiles6557 I guess it to be around 3dB, but would like you to demo if possible Thanks

Thank you.

I think it is more for variable or unknown target polarisation, such as aircraft, satellites etc,

@petermiles6557 With thicker elements on it, the band range gets wider?

You need to build one....

@petermiles6557 I may do some experiments with simple (12 or 10 AWG) First to test performance.. However.. Looking at Radiation Pattern Graphs.. I don't like the Dead Zone at the Top.. (Testing will determine how bad) this will affect Satellite Reception.

There are lots of designs on the internet, however I like to include testing and modelling to verify that it works. I will post video of the testing to confirm the model in the near future (A project in its self).

They are fun to build. I will be trying some higher bands in the future.

Correct

@@petermiles6557 Cool.

Zipped file at the bottom of the Skew Planar Wheel Antenna web page. vk6ysf.com/skew_planar_wheel_antenna_Mk2_20241022.html

The element lengths are interesting in that they are longer than a full wavelength and I agree that an extra 5mm would place the antenna in the centre of the band. Standard N connector. Yes; correct there is a nut below the upper plate.

@@petermiles6557 Thanks Peter Regarding "Standard N connector" for what cable type and where should I look to buy one just like you used. Thanks Greg VK7GM

RG213, RG8 etc.

My understanding is that you need to have approximately 1 wavelength (per the video) of a different impedance coax. 125 ohm coax is commonly used however in my case and in some commercial folded dipoles 75 ohm is sufficient in a 50 ohm system. Also I have an alternate 'J' dipole driven element that I have used on the 5 element Yagi that may be of interest. See: kzbin.info/www/bejne/gaSYi5SQobGrnbMsi=zLFmS4h47eKxC4rF And web page: vk6ysf.com/yagi_J_Driven_Element_20250715.html

Thanks Ryan

It is 690mm for 435MHz and the method to calculate this is at about 12min into the video. Keen to hear about your build results.

See details: vk6ysf.com/yagi_435mhz_6el_20230201.htm

All home made and all material is available from hardware stores except for RF connectors etc. Also all tools are basic handyman type tools, vice, drill pop rivet etc.

or alumn closeline works

How did it do? I'm curious about the use of steel in antennas. Being able to use steel instead of aluminum opens up a whole new world to my antenna making possibilities.