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OTTAWA, Ontario — At the height of the Cold War, the BBC World Service, Radio Canada International and the Voice of America used high-power, multilingual broadcasts on the shortwave radio bands (1710 kHz–30 MHz) to blast news and information behind the Soviet Union’s “Iron Curtain.”
In turn, Radio Moscow, Radio Havana Cuba and East Germany’s Radio Berlin International pumped their own versions of reality to the world via shortwave.
REDUCED BROADCASTS
Thanks to the nature of shortwave propagation, in which radio waves can bounce around the world by reflecting off the ionosphere, then off the ground and then the ionosphere again, these broadcasts got through.
Additional story at: http://www.radioworld.com/article/international-broadcasters-reconsider-shortwave/271847#