The Mysterious and Fascinating World of ‘Numbers Stations’
Shortwave radio signals, which occupy the radio frequency band between 3 and 30 megahertz, have the unique ability to bounce or “skip” off the earth’s ionosphere, allowing them to propagate over vast distances. This has attracted a devoted international community of shortwave radio enthusiasts, who exploit the unique properties of the medium to listen to and communicate with shortwave stations […]
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