I installed a pretty big one from Radio Shack with a rotor on my parents' home (on the chimney) a while back. It and the rotor work well. RS has all the hardware you'll need too and they might install it if you ask (for a fee, of course). They also sell a little book on antennas, but their salespersons should be able to tell you everything you need to know. They answer the phone "You've got questions; we've got answers," and for once the hype was true. My folks didn't need an amp for the antenna with 3 TV's hooked up. Be sure you've dealt with the lightning issue too. If I remember right it ran about $200 for everything - antenna, cabling, connectors and splitters, lightnig rod or ground, etc., and it took a Saturday and Sunday to complete from scratch. Getting new wires, if needed, through the house can be tough. But the picture was great.
BTW, the quality of your TV's circuits can also affect the clarity of your picture on a distant station, no matter the quality of the antenna. I think Toshiba is very good in this regard, at least in certain models.
I've got cable myself.