After looking at dozens of sites showing Pringles/coffee can, whip, yagi, etc antenna designs, I couldn't find directions on how to build a flat panel antenna. Sure, I could buy a good one for under 100 bucks, maybe even $50. But that eliminates all the fun. I'd like to use some of the experience gained studing wave transmission in engineering school plus my teenage years as a ham radio opertor (a long, long time ago).

Has anyone seen a "how to build guide" for flat 802.11 antennas used inside?