Most likely a winguard. As long as your sure it's not a coax problem you could look into adding the "wingman", it claims to enhance winguards reception a quite a bit. If you have a "Legend" tv the tuner leaves much to be desired. We'll be switching ours to a Vizio soon.
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Jason and Billie
2018 F-250, 6.2L
2011 Prime Time Crusader 320RLT
"PT Crew Member Since 11/2010"
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