What is Reddit's opinion of Alfa Weatherproof 2.4GHz 24dBi High Performance Die Cast Reflector Grid Wireless LAN Antenna - For 802.11b,g,N Wireless Wi-Fi?

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I used two routers running dd-wrt and a directional antenna. In my case I used a grid antenna but that's probably overkill in your situation. I would get a couple yagi cantennas and call it a day!

Edit: because I got down-voted for some reason...if you get two WRT-54g routers and one of the antennas linked, you can get adapters to connect to one end and TX/RX about 0.25mi (in my own test), and certainly much further. If you have two of them, I've seen reports at 3mi.

If you have line-of-sight you could do it via wireless lan:

• 2x http://www.amazon.com/Alfa-Weatherproof-Performance-Reflector-Wireless/dp/B004K2I70E/ref=sr_1_10?s=electronics&ie=UTF8&qid=1330974444&sr=1-10

• 2x http://www.amazon.com/Alfa-Waterproof-Outdoor-wireless-Integrated/dp/B003ILWRLI/ref=sr_1_20?s=electronics&ie=UTF8&qid=1330974494&sr=1-20

179,96$ (excluding shipping, cables etc...)

warning: that wireless lan adapter is 2W (= 33dBm), with that 24dBi antenna you are at about 57dB, which massively exceeds the regulations here in Germany, you'd have to check that with your local legislation...