I am looking for a cost-effective way to link an office that is about 3/4 of a mile from a current office in an area where tying into the frame relay would cost about $1800 per month (T1) and the current 64k PPP connection runs $600/mo. A friend advised a system he sells that can go 2 miles with 128 bit encryption but needs line of sight (don't know if I have or not.) Is anyone using this technology right now? How reliable is it? Can it go through trees? Any input/feedback would be appreciated.