There are MANY sources on the web to find frequencies in your area,
but ONE of the best I have found is the FCC. Go to
http://svartifoss2.fcc.gov/reports/st_cty_freqrange.cfm

Enter your State, your County, and then the frequency range. If you
have a dial-up connection, be cautious of the frequency range that you
enter. It can take a little while to search a large data base, and
also display the results.

Happy Hunting!!