I was hoping to hook my friend into my local network using wireless technology, but I don't think I can point a dish at another one when they're 5 miles apart. As I said, I don't know much about about wireless in general and 802.11 in particuliar, so don't take my word for it. Broadcasting not allowed. FCC regultions specifically prohibit the use of amateur radio frequencies for the use of broadcasting. Or conducting business.
Amateur radio is centered around public service and advancing the radio art.
If you think you will get away with it, there are hams who have made it a hobby tracking down illegal sources of RF emission. However, the FCC does allow other non-amateur frequencies for the purposes you mention. Title 47 part 15 tells you what is available. There are frequencies at 1.9GHz, 2.4GHz, 5.5GHz that you could possibly use for the aforementioned purposes. Also, you are only allowed one watt of transmitted power.