Owen Duffy wrote:
Whilst there are articles around about the performance of shallow
buried radials, I have not seen any that deal quantitatively with
radials laid on the ground, or pinned to the ground as you describe,
and the effects of those different installations on antenna
efficiency.

Will NEC-4 accurately model radials at different depths?
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73, Cecil http://www.qsl.net/w5dxp