My 2 cents: I used a pair of 24dB dishes and two bidirectional amplifiers to get highspeed Internet when I moved to Miami. One antenna was at my house and the other with DSL at my Mom's 6 miles away. It worked good despite having buildings, trees and the Florida Turnpike in between. I got all from
http://www.ydi.com 3 years ago. Kept one of the antennas and the amp still works fine. I've gotten reports from neighbors a few blocks away thanking me for Internet access to their laptops.
Later,
JR