How artificial satellites are used in the transmission of television programmes to large distances

Dear Student,

Artificial satellites help in the transmission of TV Programmes over large area because of their height and their function as signal repeaters. Radio waves travel in a straight line. Assume the Earth is a perfect sphere. A radio wave from the surface would be a tangent to that sphere. This means that from the equator, a signal would not reach something over the horizon. 
A satellite receives a signal from the surface, and re-broadcasts it from a higher place that can see a larger portion of the Earth, including those over the horizon.

Regards

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