First, check that you do not have the foil backed insulation in the attic along the roof. As for fishing the wire, based on work done at my house by the electrician, you will probably need to cut at least one hole in the drywall to drill through the header and guide the wire to the low voltage panel. IMHO, I would see if there is one cable connection that you would not be using, and then use that for the new antenna, this is what i did at our house for an outside antenna connection. Good luck with your project.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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