Since the early days of the cold war and culminating with the Russian Woodpecker, ham radio operators have reported powerful jamming-like wideband signals creating disturbance in the amateur short wave (HF) bands. These are created by powerful over-the-horizon (OTH) radars that use the HF spectrum to "visualize" significant portions of the entire planet in just one sweep by using the all-so-loved (by us amateurs) phenomenon of ionospheric reflexion.
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