Where are you and what channel is it? On a physical level, the only real barrier is buying the right equipment.
If you’re say, in the US, then transmitting on a channel where you’re not supposed to likely gets you a visit from the FCC.
Thing is, if you’re trying to compete with broadcast FM you’re going to have a really hard time overpowering their signals most of the time.
If you’re just competing with some other amateur, then expect to get yelled at.
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