But here's the thing.
1.) if you're crushing a good signal line of sight for any distance, then you're screwing up the signal for everyone else for about 10 times that distance, minimum, so you're going to **** a LOT of people off.
2.) Ham's fight very hard for their rights to broadcast on any frequencies at all, and will work with the FCC to hunt down and (metaphorically) crucify anyone abusing the system.
So if I were going to do something like this, I'd be looking at a very directional antenna, and I'd be very picky about when I used it, lest I get in a LOT of trouble.
I mean, in theory of course, because I would never break the laws of this great nation, which are obviously established for our protection.