For those curious about what channels are likely available where you live, there are some excellent web-based tools at http://www.tvfool.com to help answer that.

You can give your address or coordinates and the height above ground of your proposed antenna, and they will calculate based on the location and height of your local station's antennas and the terrain between you and them how good your signal should be.

They will give you maps and tables showing this and showing what directions you need to aim your antenna for each channel.