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waves spread out as distance gets farther. So at certain places there is no radio. Also if big concrete buildings or bridges in way, radio waves cant get through it

because FM signals go in a straight lines while on the other hand am signals scatter so more people can use it

Radio broadcasts bounce off of the ionized layer of the atmosphere, the ionosphere, in order to reach more distant receivers, but the state of the ionosphere can vary, and it does not always reflect the way we want it to.

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