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The range from my house to both me friends would be around 1400 feet.
What you want to do is very possible provided you can "see" each computer from the access point. I live in the Ozarks Mountains in Southwest Missouri, USA. I had a very successful wireless connection between two towers at a distance of 30 miles using 802.11b equipment. Of course 1400 feet is no problem at all provided that you have quality directional antennae, use low loss cable, and have an un-obstructed view of the other two. If you would give me some topographical information I would be happy to help you with this project...it just so happens that I also have a Cisco Aironet 340b radio about 70 feet of LMR-400 coaxial cable, a12db gain antennae and an amplifier that would go roughly 20 miles, this is used equipment that works great that I no longer need.