I have a few ideas about how it can be done and one I'm leaning toward is sharing over a mesh type network (ala wifi) via multicast to anyone who can hear. Obviously that presents some issues of its own. Ideal would be something small and embedded I could mount on the tower or a single box with multiple dual tuner cards in it.
Having two tier service by running cat5 or fiber is possible (their cost to run the cable) as well but there should still be an open way to watch over wifi. I'm not looking to make a profit off it though.
So what are some other possibilities to consider? Has anyone else tried this? In trailer parks or apartment buildings for example?