I am not an Antenna Guru to say the least, but I have found one way to tune a coil from 20-40. Haven’t tried this yet on 6-10-15-17. I have raised the base of the antenna by bolting it to a PVC, or other enertish tripod etc by 5-6 feet off the deck. Then I run 2 but even one works, quarter wavelength radials slanting down about 1 foot apart at the tip. I set the coil to the manufactures recommended position for the coil for the band I am after. I then use RigExpert to check SWR. I then adjust the length and the elevation of the radial, now technically not a radial but rather a counterpoise and part of the antenna, until it is on the mid point of the band. Time to tune. I will adjust the coil to fine tune it but stay as close as I can to manufacturers recommendation. I found the best is: 2 counterpoises are a little shorter than Quarter Wave length, and attached as close to the ground as I can get them, sometime the best is of the wires actually slightly touching the ground. I don’t know if this is for others, but it works for me on my balcony I get very close to 1-1.0 at mid point. And 1.3 at the edges. 40 is harder but it works. Again I have not tried this with 6-10-15-17. I don’t use a tuner by the way. I will try one too soon. Hope it helps. Bob AI5QE Sent from my iPhone On Jun 18, 2024, at 4:20 PM, Andre Pollard via BVARC <bvarc@bvarc.org> wrote:
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