Antenna Topics: A 20 meter vertical antenna with tuned counterpoise, post #190
KH6JRM's Amateur Radio Antenna Topics: A 20 meter vertical antenna with tuned counterpoise. This weekend has been outstanding on Hawaii Island. Weather conditions were partly sunny and a bit cooler, thanks to the return of gentle trade winds. Most of the vog (volcanic smog) has been blown off and most of us can finally breathe normally. In other words, this was a grand day to build antennas. In my last post, I described a 40 meter vertical with tuned counterpoise that has performed well on the 7 MHz and 21 MHz amateur radio bands (the 15 meter antenna uses the third harmonic of 40 meters and works as a 3/2 wavelength antenna on 15 meters). Since I built the antenna for the 7.088 MHz Hawaii Afternoon Net, it functions well around 21.264 MHz in the SSB portion of the 15 meter band. Now that I've enjoyed some success with this vertical, I decided to make another vertical antenna with a tuned counterpoise for 20 meters, concentrating on a frequency of 14.200 MHz. Like