Here's your reading homework for the week:
This is Rob Flickenger's Wiki for "Wireless Networking in a Developing World". There's quite a bit of good, basic, and useful information in the book. There are several construction articles for different common antennas. Also info on sizing solar powered access points, towers, networking, troubleshooting, etc. Kinda spotty in a few places, but still well worth reading, especially since I had nothing to do with it.