Pick the right antenna(s) to begin with. Use TV fool to get an idea of the signals available, their real channel number, strength, azimuth and path profile. This information is far more valuable than the distance alone. (It's common to see advertising that includes the range of an antenna in miles. There is no standard method used, each manufacturer can use any method they want when making estimates. Some are conservative and a few make claims that are beyond belief.) If you don't know how to interpret the information in a TV Fool Reception Report, simply ask for help in the
Help With Reception forum.
Don't commit to a specific mounting location too soon. Before drilling holes or committing a lot of time and money to a particular location, consider testing reception by placing the antenna there, using temporary means if possible. Test reception using a relatively short length of coax and a known good receiver. If you get poor results, you can try alternate locations.