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I once found a website for a company that markets FCC certified transmitters that are made to be sync’d together. They come is a post-like configuation with solar panels, batteries, recievers for rebroadcasting the signal and a stereo transmitter. All you do is dig a hole in the ground and plant it, move on to your next hole & plant another one. If anyone knows of the company or what the website is please post it!
They cost about $2,000 each. But considering that a new or existing FM station costs in the multi-millions, the cost of this system is quite a bit less…a lot less.