From google maps you're not too far south from Buffalo, Fort Erie or Port Colborne. Many people use Channels Master's 4228 antenna had seem to have good luck with it. Outdoor is better than in the attic and the higher you can get (tower or on the roof) is best. Channel Master Antennacraft and Wineguard make traditional style antennas designed for the "digital age" that might get you more distant stations, but I have to basis for comparison, other than the antenna I'm using is almost 20 years old and still works great.

Check out a local computer store or Radio Shack.

The best antenna I have installed so far is a 4 bay antenna by Electronic Master. It has a preamp on the antenna and comes with a small in-line booster you connect behind your tv. Right now, this is the antenna I recommend.

Good luck!