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I'm intrigued by the stories surrounding the so-called "Russian Woodpecker", a "sharp, repetitive tapping noise" that disrupted communications signals worldwide between 1976-1989. It came from huge antenna arrays located near Chernobyl & in eastern Siberia https://en.wikipedia.org/wiki/Duga_radar pic.twitter.com/o2XD7d47WG
Here's some more images of the Duga-1 array within the Chernobyl Exclusion Zone https://commons.wikimedia.org/wiki/Category:Duga-1_radar#/media/File:Duga_radar_station_within_the_Chernobyl_Exclusion_Zone,_Ukraine_(04).JPG …pic.twitter.com/4aWGg1gqA4
There's a US-based research radar that lurks about the 60m band even still. Not as annoying as the woodpecker, though
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