The high-frequency electromagnetic waves do not reflect the ionosphere, but penetrate through the atmosphere outside the Earth. To send a television wave away, it is necessary to use periodic broadcast stations to receive television waves from the transmission station, which comes in a straight line, and then extend the signal to the next station, because the signal travels in a straight line, so the signal will only go far about 80 kilometers on the surface of the earth. This is because the surface of the Earth is curved, or it may use microwave waves to send signals from the station to a satellite orbiting in a stationary orbit compared to a specific position on the Earth's surface: the satellite has the same angular speed as the earth's self-rotating speed. The planet then sends the next wave to a remote receiving station.
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