Well I tested all the cables and individually they all work without any issues, including the RG6/U running through the wall. I'm not using any splitters but I do have 2 F jack to jack couplers.
The only other thing I can think of is that the signal is somehow blocked by the roofing material (asphalt shingle roofing). Which is why it works when I set it up in the family room but not when its mounted in the attic.
Still chipping away at it when I can, thanks for the input and keep it coming if there's any other ideas.
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