Indoor antennas are shit. The only way to be serious about it is a big honkin' mast outside.
Go here, play around, see how many directions you need to point. See what colors it's gonna take. Then go here and get sumpin' good. This mammerjammer with a rotator is pretty much the outer limits of what you can bother with. Note that it's more than 9 feet long by more than 8 feet wide.
An outdoor antenna is basically the second thing on my list to buy when we get our own place. The only thing that's above it is a plunger, because lets be honest, you don't want to be without one of those.