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Channel Master doesn't make, as far as I now, a separate FM filter, but there is an FM filter in the 7777 and 7778. They do make a separate LTE filter for cell phone interference.
To see if you have interference from other services, you would need a spectrum analyzer, which is expensive.
Otherwise, it is trial-and-error to see what helps if you have an interference problem.
Cell phone transmitters use different frequencies according to what carrier is in your area. Some use frequencies just above TV CH51; others use higher frequencies that cause less interference to TV reception.
Last edited by rabbit73; 10-Jul-2016 at 1:22 AM.
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