Joat42 wrote:Brigade XO wrote:Don't know if they are still doing it but back in the 50's and 60's the USSR would decide that they didn't want people to use various frequencies and hook up massive power sources to transmitters and essentially blot out the frequency with interference. Some of the rumors were that these were ones use by things like Voice of America or for clandestine transmissions to agents- that sort of thing.
Look up Duga or Russian Woodpeckers, most of these where just immensely powerful over-the-horizon (OTH) radars.
The US has a couple hidden in plain site as well . but these are really just long baseline backscattering devices.