TCP/IP over optical links may be a good option if they are just triangulating radio.

HERE is a link to an article featuring full-duplex voice over cheap laser/LED optical link over 95 miles.

http://hackaday.com/2012/09/22/communicating-with-a-beam-of-...

If anyone can get that to the "right-side" then, by all means this may very well be an option for establishing high-speed TCP/IP as well.