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I don't have the details, but my dad did something similar to what you want, across an 8 mile span, and it works very reliably. In his case, he had clear line of sight due to being up on a hill and shooting to an access point he set up at a friends in the valley. He used a zzyyx router (cheap, has a bridge mode, and great support) at his end, some generic linksys or such at the other end, and a couple of directional antennas (dont remember the exact specs). Took a bit of tinkering to set up, but he gets better throughput than my cheaper DSL.