just make sure you have a clear shot ! if you have trees int he way it gets ugly quick ! I played with this for 6 months spent also about 5K on equipment finally gave up and paid for a fractional t-1 for 600 bucks a month for a whopping 384K.
get 2 of the giant 24db dish type antenneas you will be much better off..
http://www.hyperlinktech.com/