I built a 20/40 dipole and was really struggling getting the resonance points where I needed them to be using my radio and SWR meter. I finally ordered a nanovna and was able to dial it in quickly hanging about 8 feet above the ground. Then when I hung it above my roof I needed to tweak it a bit more. Now my min SWR is right not the FT8 frequencies. I did not have to get into a lot of theory, just did SWR sweeps over selected frequency widths. Great tool for tuning an antenna. -- John Faivre WA9SGD
