Under Normal circumstances Entry Level Wireless was not meant to cover distances longer then few hundreds feet outdoor.
However few people as a special project did mange to bridge distances as long as 5 miles.
Depending on the actual distance you might need to compensate for the curvature of our Planet, and or differences in heights between the two places. So you would need to build a tall Tower in each location and install highly directional Antennae.
You will have to use some sort of geodesic/survey tool to measure the height and Azimuth, and make sure that you are really pointing one Antenna to the other.
When the Antenna is away from the Transmitter (Access Point) Length of 2.4GHz coax cable that has to be used cause very fast RF deterioration. As a result long coax is not used in such installations. The APs are installed with the Antenna on the Antenna?s masts and run CAT5e down to your source.
All of this must be adequately protected from the Weather elements (you have tro buy special housing for the APs and a bunch of Arrestors), other wise one lighting storm and ??your are back to the Future??.
Link to:
Wireless Networking Reference - Antennas / Range Boosting.
Assuming that you can execute such a project you would need to bridge the two sites
This link has info about Bridging options (not related to the distance).
Link to:
Wirelessly Bridging Home / SOHO Network.
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