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Did something similar for a guy at work long ago. Same scenario basically, we needed a narrow-beam signal to go roughly 500ft, no trees. Used a tuned cantenna at the receiving side wired directly into the wifi card, focused at the access point. Used a higher gain directional antenna on the access point. We didn't try it access point-to-access point since that was not needed, but it would have been the exact same thing with the antenna being on the access point instead of on the wifi card. I don't remember the signal strength in dB, but the connection was solid and speed was good. This was on 802.11g, have not tried on pre-N but results should be even better.
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