This is probably not exactly what you're looking for, but a few months ago, I researched the same problem. If found a home build antenna designed by an amateur radio guy, which seemed interesting. A similar design had a guy reportedly receiving stations from hundreds of miles away. I found the plans et al at "http://www.n7qvc.com/amateur_radio/copper.html"

I never got around to building it, as there was too much going on at the time and I had recently gotten digital cable, which had 20 or so music only channels, which get the job done in a pinch.

So if you're crafty and have an attic to put the ugly thing in, maybe the design would be a relaxing project. Otherwise, I can only say that the powered antenna I paid $80 one time before made 1 station clear, while killing reception for all others, so I took it back and won't ever buy one again. But that's just my experience.

Good luck.

S.