Rick is precisely correct.
When HF communications was in its heyday, the U.S. Navy NSS transmitter
facility (Annapolis MD) was on the 230 acre Greenbury Point peninsula, nearly
completely surrounded by the Cheaspeake Bay.
On the other hand, the NSS HF receiver station was high in the mountains of
Sugar Grove, WV in what is now the National Radio Quiet Zone. The receiving
antenna was a massive pair of AN/FRD-10 Wullenwebber circularly disposed
antenna arrays (CDAAs) that replaced the much noiser former receiver site in
Cheltenham, MD in 1969.
---- Original message ----
>Date: Tue, 01 Feb 2011 09:28:15 -0800
>From: "Richard (Rick) Karlquist" <email@example.com>
>Subject: Re: [RFI] Across-the-bay line noise from 17 miles away
>The problem here is the salt water path.
>I have found from driving around that power line
>noise travels a long way when over high conductivity
>ground, so that even getting miles away from the
>nearest power line is no guarantee of a noise
>free area. OTOH, up in the mountains, where
>conductivity is poor, about 1/2 mile away
>from the nearest power line is quiet as a
>church mouse. The ideal station has a transmitting
>antenna over salt water and a remote receiving
>antenna on a mountain top.
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