The amplitude and phase of a field after ground reflection depends
on
the polarization, and is quite different for horizontal and
vertical. It
of course also depends on ground conductivity and permittivity,
frequency, and angle. The equations are simple, and can be found in
Kraus and other references. Those equations are used by NEC for
determination of the far field pattern.

Roy Lewallen, W7EL

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Yes! But what's the ball park, rule-of-thumb value in dB ?
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Reg