On Sun,5/21/2017 6:00 PM, Bill Turner wrote:
Antennas can be too high, believe it or not. Talking about DX, not
groundwave.
I've studied that extensively, and even wrote a tutorial applications
note on what I learned. It's pretty near impossible for most of us to
rig an antenna too high for bands below 30M -- a quarter-wave is low, a
half-wave is just starting to get good, and 3/4 wave is not too high for
anything but NVIS. My 40M dipoles at 120-140 ft play REALLY well. That's
about 1 wavelength high. My 30M dipoles are at 100 ft (also about one
wavelength). BTW -- contrary to widely held myth, 0.22 wavelength high
is optimum for NVIS, and 0.33 wavelength is only 1 dB down from optimum.
The tutorial app note is http://k9yc.com/AntennaPlanning.pdf
73, Jim K9YC
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