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An introduction to the amazing NanoVNA instrument. Shows a 140 dollar NanoVNA-F unit (4.3" screen with V2.3 hardware and 0.1.5 firmware) being used to measure an HF multi-band vertical antenna. The antenna is assessed in terms of S11 rather than SWR and some reasons why S11 is a better measure are offered. Future videos may go into S11 (and S21) in more depth, as well as show how to use the NanoVNA as a synthesized signal generator.