![]() In World War II it was used as a propaganda tool for an international audience. ![]() Shortwave broadcasts of radio programs played an important role in the early days of radio history. Thus shortwave radio can be used for communication over very long distances, in contrast to radio waves of higher frequency, which travel in straight lines ( line-of-sight propagation) and are limited by the visual horizon, about 64 km (40 miles). This is called skywave or "skip" propagation. Therefore, short waves directed at an angle into the sky can be reflected back to Earth at great distances, beyond the horizon. Radio waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 metres) above the medium frequency band (MF), to the bottom of the VHF band. Shortwave radio is radio transmission using shortwave (SW) radio frequencies. Grundig Satellit 400 solid-state, digital shortwave receiver, c. 1986
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