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I don’t want any trouble either so I had a local radio company do a field strength test .
At 25 milliwatts and a 5/8 wave groundplane at 28 feet , the field strength test showed that I was within the limits of part 15 FM .
But a big part of getting good range is a clear frequency to transmit on and a good receiver to listen with. Car radios are the best recievers ! Especially when there are no strong stations nearby.
But you should know that at a mile away, my signal is not “booming” in , it is very choppy when in a moving vehicle and most people would not want to listen to such a weak signal . (except me)