Remove ->All<- of the twin lead antenna wire every where through out the system both outside and inside of the building.
Only use RG-6 coax to do antenna system wiring.
Use passive and active devices that connect to RG-6 coax.
Install a NEW Matching Transformer (Balun) that connects the New RG-6 coax to the antenna.
Aim the antenna at about 80 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
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Digital Tv Tuners can develop -Digital Glitches-that are not cleared out with simple channel scans.
Do Double Rescan ,
www.wchstv.com/DoubleReScanAlert.pdf