The bsexton site is a favorite of mine. For finding DTV stations, you need to change the Status Filter from "LIC" to "none", as most digital stations don't have final licensing approval from the FCC. It's also a good idea to change the radius to something less than 150 miles, as you're going to get a listing for everything, including low-power translater, within the radius you enter.
You'll get a listing for every transmitter within the radius, its distance, and heading (true North, not magnetic North). It's better to enter your actual longitude and latitude rather than zip code, to get the most accurate results. Clicking on a channel number gives you the location of the transmitter, as well as additional info such as Effective Radiated Power (ERP) than they've applied for (which may be more than what they're presently transmitting), the antenna Height Above Average Terrain (HAAT) in meters, and the antenna Radiative Center Above Mean Sea Level (RCAMSL), essentially the altitude of the antenna, in meters.
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You have a right to install OTA and dish antennas on property under your control.
See
http://www.fcc.gov/csb/facts/otard.html