One more thing ... If you're messing with RF, contact your local Ham club!

Really. Those guys are all about antennas and propagation and keeping the FCC happy. They'll have the tools and expertise to help you install, understand, and verify your entire radio system. It'll look good in your builder's log too that you bothered to get semi-pro help on your field strength, spurious emissions, reflected power and so forth. And you might make a friend.