This was pretty well studied by George Hagn at SRI in the 60s/70s in the
context of antennas for field use of HF and VHF in Vietnam and there are
some publications out there. In fact, that's what led to the development
of the Open Wire Line (OWL) technique.
Gerry Burke (of NEC fame) told me that the OWL technique doesn't always
work. IIRC, he said that there was no combination of NEC ground
parameters that produce simulations that agree with the measured data.
Rick N6RK
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