I aint no network guru by no means but I recommend this. It's directional but will saturate the area with wifi because it isn't shielded all that great so it even throws wifi behind it. I bought two of these for a P2P about 200 feet away from my house to my grandfathers old house. Set the one on my roof as AP and the one on the roof at the old house as station, then bought one of their Unifi APs for inside the house. I have 5 acres and the whole thing is saturated with wifi even over to my dad's place over 400 feet away. I could have accomplished what I wanted with just the AP pointed to the old house and wound up with overkill, but it's cool because I have wifi on the whole property.
http://www.amazon.com/Ubiquiti-NSM2-...words=ubiquiti