FM radio is very line of sight. And they also use a ton of power to make the signal as clear as possible. Due to that, you can’t have another station on or close to the same frequency for a long distance away. If you did like you are suggesting, having the same radio station using the same frequency in multiple locations close enough to each other, you would hear an echo while listening. Some stations are carried on multiple frequencies to get a larger coverage footprint but that is one owner of multiple stations doing it or syndicated radio.
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