Skywave

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Radio waves (black) reflecting off the ionosphere (red) during skywave propagation.

In radio communication, skywave or "skip" is the propagation of radio waves bent (reflected) back to the Earth's surface by the ionosphere. Skywave propagation is used at shortwave frequencies to communicate at transcontinental distances, around the curvature of the Earth. As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, a shortwave radio station or (during sporadic E season) a low band TV station can sometimes be heard as clearly as local stations.

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