Martin,
>From my experience as a ham radio operator, the ground plane antenna you
>describe
is made correctly. The radiating element (the vertical rod) is 1/4 wavelength
and the ground plane should be the same dimension. That is exactly what
I have in my Europa and it has worked flawlessly for over 15 years and two
transponders
(Garmin GTX 327 and now Appareo ESG).
Why Dynon suggests a larger ground plane I don't understand. Antenna theory
says
that the ground plane should be the same 1/4 wavelength as the radiating
element.
Jim
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