Comment Slotted Waveguide (Score 1) 558
I've never used one but a friend of mine in Denmark did and he said he was getting good wifi signals upto a kilometer away. Google "Slotted waveguide" and check it out, easy to build, cheap and they supposedly work really well. I don't know what the tree cover is around there, but it's a cheap, quick solution to test, and you can build a working test version out of cardboard and aluminum foil. If it works, you build one for real, if it doesn't, you haven't wasted too much time, effort or money testing it out.
Good luck.
Good luck.