That's NOTHING compared to this :
http://www.adversarialsciencelab.net/newindex.html
It has a range of 36 miles in the desert.. I'm planning on putting one on top of my warehouse, and then one on top of a building on bernal heights (2 miles as the crow flies), one on my datacenter (I can see the top of the building if I stand on a 6 foot ladder on my roof) which is 3 miles away, and one on this warehouse a mile away I can see from the top of the ladder..
To the 2 warehouses which are geek/musicians communes where a lot of my friends/housemates friends live, I'm going to setup a secured VPN for sharing music..
To my datacenter .. well, 802.11g to a datacenter with 300mb/s of bandwidth .. suffice it to say, I'm starting to feel silly that I pay $200/mo for my 3mbADSL link from speakeasy..