Hi there. The reason I'm into the wireless scene is because I am far enough from every CO in my neighborhood that I can't get decent connectivity. I'm sure that just outside of every city, there are many people in my situation, but I get to live in the wonder that I'm right in the middle of it, yet cannot have decent phone/data service.
I'm using Lucent products because I purchased an Apple Airport. I also picked up a Orinoco Gold card and have done all my testing with that.
Here is a link to some antenna design information. http://www.netscum.com/~clapp/wireless.html