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I have found http://www.radio-locator.com/ to be a very good resource for choosing frequencies. You can search a number of different ways. Search on your zip code to display all frequencies receivable under normal conditions in your area. Stations are displayed along with a little meter display that shows relative strength in your area. Go to “advanced search” to search for all stations on a specific frequency. For example: 1610 shows only one commercial sation in Canada, CHHA in Toronto. You should also search on the adjacent frequencies (1600 and 1620) to see if there is a big bruiser near you.
When I have searched in the past, low power traffic info stations and the like were also displayed. They weren’t there when I just did a search on 1610. I don’t know if they have been deleted or its just something with the site currently. In this area the Valley Forge Park info station is a factor on 1610 (It doesn’t appear on the http://www.lpam.ws/search/ site either).
I suggest finding a likely frequency from the radio-locator web site and then verifying it is good by driving around your expected coverage area while checking for signals on your car radio. Don’t expect a completely clear channel, but if you only hear a very weak station fading in and out of oblivion, then the frequency is a good candidate.
Also, don’t limit your search to just the extended band. In this area 1580 is just as good as many of the extended band frequencies.