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Another transmitter you might want to consider is the Grain Industries GI100/1000 by Wayne Miller. It is primarily designed for outdoor use. In Bill’s transmitter challenge on HB the GI100/1000 came in second behind the Rangemaster in terms of coverage. It is FCC certified.
As has been mentioned before, coverage can also be affected by how your signal is processed. Some type of audio gain leveling is necessary for the transmitter to modulate properly without distorting. Here again is Keith’s great info on proper audio processing for AM:
The GI-100/1000 has a built in feedback gain control to ensure that the TX achieves full modulation.
For even more coverage, you might want to consider multiple transmitters around town which will give you an ersatz SFN. There is some question as to whether syncronizing carriers on multiple Part 15 transmitters is legal. But you can certainly syncronize audio legally by delaying the audio to the transmitters if need be.
I’m in a similar situation to you. My HOA is strict regarding rooftop antenna installations (I still can’t convince the board that a DirecTV dish which they allow IS an antenna). However, I do have a backyard and can do what I want there. So I plan on doing a ground level installation using the GI-100/1000 and a copper rod driven into earth for ground. I can get power to the TX but not audio. So I plan to use a Part 15 FM TX as an STL, packaging the FM radio and the GI-100/1000 audio/AC interface in a weatherproof box and mounting that on the pole with the GI-100/1000.
But there are a number of ways to go as far as HOAs and rentals are concerned. The Legacy is broadcasting in “stealth” mode by keeping his antenna indoors near a window. I know of others who have been running longwires along rain gutters or drain pipes. Just gotta experiment.