Jim Jarvis wrote:
> With due respect to Jim, Rick, David, Roger, and others who have waded in
> on this topic...some of which is captured, below....might I offer a
> simplistic observation on what is a complicated topic?
>
> The physics of the near field environment will act the same, for arrival or
> departure of signals. What is different is, the signal ARRIVAL angle and
> phasing, is determined by the ionosphere, not the antenna. Therefore, how
> the refractive behavior of earth relates to the arrival of that
> complex...and different...signal is anybody's guess.
>
> The ANTENNA, however, will still have a response pattern determined by the
> geometry and refractive content of the immediate environment. Whether the
> ionosphere presents signal inside that pattern...with what polarization or
> phasing, that's another matter.
I think, though, that for terrain effects (e.g. that which HFTA is
fooling with), there's no ionosphere involved, so an assumption of
isotropic media is probably valid. So reciprocity will work.
Whether or not the incoming wavefront is stable is a whole 'nother story,
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