Hi guys, I am trying to beam a wireless signal to my friend who is approx 3000ft away, in a somewhat open space (2-3 houses in between, a couple sparse trees). My idea is to purchase a pair of cantennas (12db 30degree beam) to make the connection. We did manage to get a max signal of 20 on NetStumbler using a 120degree sector antenna on my side, and a 6db usb mini panel style antenna on a laptop on their side. So hopefully a pair of good cantennas could up the signal? I would just like to hear an opinion or 2 before we shell out the money for the cantennas. Also, i'm wondering if height makes a difference? (ie--buying some good LMR400 and running a 25ft cable to put a cantenna on the roof instead of indoors?) Thanks.