You can do the best of both worlds with AM Part #15, like I am. I'm doing the just under 100mW to a 9ft antenna. How far that gets you depends upon what's around you and soil conductivity. In the Summer, I don't even reach 1 mile in some directions. Winter, I've heard my signal up to 3 miles, but in the middle of a quite, noise free, parking lot, and with the engine off. Any bit of noise would obliterate that. Oh... And that's middle of the day. At night, hammered by night time propagation. That's where the other method comes into play, AM Carrier-Current Coupling. Some are now calling that PLC = Power Line Coupling. I stay away from FM, since the political climate for that just sucks. So, how far does that go? Thus far, this is the worst location for it. Before hand, I did Carrier-Current in a town square, and later, in a suburb. 1.5W carrier was heard in some areas as far as 3 miles, and this is from the street measured. Just how far that went into people's houses and apartment complexes is anyone's guess. Where I am currently, in one direction, there's a brick-wall utility transformer that stops my Carrier-Current station in one direction. So, it doesn't matter if I do 100mW, or 10W. The other direction is a little better at about a mile. I also use a much lower FREQ for Carrier-Current, (Below 1MHz.), and that carries further on the long power lines. What puts people off of Carrier-Current Coupling is coupling to the power lines. I Neutral inject, although myself and another station op are trying to make a Layman's Plug & Play AM Carrier-Current Coupling Transmitter. And, we have a model where this has been done for decades. Wireless FM Intercoms that you make use from your work shop, basement, den, kitchen, garage, etc., that uses the house wiring to carry signal around the house on most NBFM, but some AM ones were made, and FREQ's from 140kHz to 180kHz. Then, there's the posting and links from Boomer's page,
https://www.hfunderground.com/board/index.php/topic,72355.0.html Lots of good info there! He should have the 1959 article of the AM broadcast band Carrier-Current Baby Monitor. So, How cheap can you do all this? That all depends upon how resourceful you are. So, like to have you on AM. We look for all the permissible license-free loop-holes we can get. Good luck!!!!! OH!!! Here's another DIY link for you from MRAM1500 with his home brew Part #15 antenna for his AM station,
http://mram.us/AntennaStory.html I may follow his lead myself, if something were to happen to the present copper 9ft antenna that I am broadcasting with.
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