Comment Line-of-sight + Wi-Fi + 2 cantennas (Score 0) 558
Just use a half decent router (a hacked linksys would be nice, so you can play with the xmit power settings), two can-tennas (buy for 20 bucks or make them yourself, no great skills necessary) and line-of-sight (could put the antennas on the rooftop, or up on a mast)