Has anyone some experience with modelling antennas over
real ground, at low heigths?
I make a modell of a 20m Yagi in free space, resonant at 14,200 MHz.
It is a narrow band design. I let AO optimize the ant.
Now I put the ant over real ground at a low height, let's say at 5m
or 15 feet, 1/4 wave length.
Result: The pattern is changed because of the ground effects, as expected.
But I thought, the proximity of the elements to the ground will have a great
effect to the resonant freq of the elements and will make the ant misbehave.
Or in other words:
Is 1/4 wavelength high enough not to have any major influence on the
freq of the elements? Will modelling an ant at that low heigths give real
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