It's clearly not as simple as a "capacitance to ground" effect.
The cyclic nature of the resonant frequency vs height, plus the fact
that it is more pronounced over better-conducting ground, suggests to me
that is related to the "interference" effect outlined in the ARRL
Antenna Book in the section "The effects of Ground in the Reactive Near
Field".
Steve G3TXQ
On 01/06/2016 21:45, Hans Hammarquist via TowerTalk wrote:
To me, and obviously I'm wrong, the capacitance to ground should affect the
frequency with the result that the fx should increase when the ground
capacitance decreases up to the point where speed of light start to have an
effect.
Anybody with a "simple" explanation?
Hans - N2JFS
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