It just goes to show: your mileage may vary. I've got a puny little D-Link WAP in my house and it just barely provides 5Mb/s over the main living areas dropping down to 2Mb/s in the basement. I've started looking into antennas and other arcane radio bits well beyond my competence, but now I've seen what it looks like when the pros get involved. 72 miles!!!! Dayum!