Just thought I'd add my $.02: I live in NW Washington, DC, 3 miles or so from most of the towers. From that distance it would seem that I could get away with just about any antenna, but I've tried a few of them and couldn't get a reliable signal from any of them but the non-amplified Square Shooter -- likely due to interference from the 300 or so DC, US and international agencies using the airwaves around here.
I know that the antenna is kind of gimmicky, but this was the only one I could find that would blend in enough to escape detection from the historic preservation folks while at the same time give me decent performance. My only gripe is that I can't get the WB network, as it's in the opposite direction from the towers -- no great loss, though.