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Thanks Carl for the prompt to comment on AM. We have a completely different situation than what I was citing for FM. We also have something to gauge the requirements, namely the TIS stations.
I am no expert on this but if I recall the TIS are allowed up to 10 watts and have an antenna height restriction but they also have a field strength restriction. Nonetheless, it is a guide to what to expect.
Here, the city TIS is located 2 miles from my house and I can receive them Q3 in my basement with a portable AM radio (lots of light dimmers here). On my ‘big ear” antenna and comm. grade receiver they are Q5. (for those wondering, Q1 is barely readable, Q5 is full quieting and perfectly readable). I can receive them mobile at distances up to 20 miles (Q2 or Q3). Any one else checked local TIS ranges?
More to think about.