This is already outdoors point-to-point stuff

And I've seen similar gear being used to carry about 30MB/s across 5km of (flat) farmland. This involved two scaffolds at either end though, which I wouldn't recommend for a permanent installation.

But those flat-pack antenna/transceiver units are a bit iffy to aim right. With a parabolic dish like this http://www.wifiandmore.com/images/uploads/HYPERLINK HG2424G-NF.gif you can tie a laser pointer to the forward-pointing bar and get the aim spot-on in minutes, weather cooperating.