IIRC there is like 3 different conflicting sets of rules*. Some based on power, others based on distance, and interference...I always check that there are no other analog or digital stations receivable on the channel I want to use so no one in the ~1 block range I can transmit is bothered with interference. It is all cable and sat in my neighborhood but you never know who is using OTA in a bedroom or kitchen.
*Depending on which you break they either turn off the TX and warn you, destroy the TX and or fine you.
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