Is Fox intermittent or completely missing?
Do you have an alarm with wireless transmitters?
I tried helping someone with a mysterious strong channel 7 issue a while back & we never solved it. Channels 8,9,11,12 & 13 were fine. I still think the wireless sending units for his home alarm were the culprit. Channel 7 only came in with the antenna placed at a far corner of the yard. There was something in that house that created intermittent interference that switched on, then off every 2 seconds.
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