Just found it:
"Siting Criteria for HF Communication Centers." Published in 1962 by NBS.
Paul, W9AC
-----Original Message-----
From: Paul Christensen <w9ac@arrl.net>
Sent: Saturday, March 2, 2024 5:39 PM
To: 'towertalk@contesting.com' <towertalk@contesting.com>
Subject: RE: [TowerTalk] New N6LF Ground Probe Designs
> It does not show ground permittivity. Both conductivity and
> permittivity influence antenna performance and both can vary greatly
> greatly with frequency.
A while back, Frank, W3LPL attached a link to a paper written on behalf of
either NBS or DoD. As I recall, the discussion focused on the
non-applicability of ground wave propagation above the BC band, including
160m. But it also addressed the importance of the near and mid-field soil
quality out to some distance from a vertical radiator for long distance
communication.
N6LF certainly addresses this material in his work, but I'm specifically
referring to the government publication. I just looked high and low through
my cloud files and cannot find it. I'm not sure if Frank still monitors
this list. Anyone have a link?
Paul, W9AC
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