The Buzzer: Are there secret spy messages on the radio?
Twenty Thousand Hertz
00:00
What Is Shortwave Radio?
As a child Andrew would often hear strange voices repeating a set of numbers. Shortwave radio signals can travel thousands of miles across oceans and entire continents. The audio may sound pretty terrible but on the plus side you can basically send a message around the world. These days you can buy a basic shortwave radio for about $50.
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