Yeah it can be done... but you might have to make them the same LAN. All you need are two access points in bridged mode connected to eachother using a directional antenna. I used a 14 dB gain directional antenna pointing at another about 250 meters apart, worked great until a tree started growing in the way and soaked up all the signal.
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If it ain't broken, don't fix it... Damn, really wish I'd follow this advice.