Installing the CS2V Complete UHF/VHF antenna above the roof in such a manner that the roof and house are not impeding and blocking reception in the directions of , North , North West , West , South West , South East.
Will most likely clear up the reception issues.
Aim the CS2v Complete UHF/VHF antenna at about 305 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
As Always , All coax and couplers and splitters and etc. through out the system are suspect of being bad , resulting in degarded or no reception.
The best coax to use for coax that is exposed to weather/water is the coax that has the Compression type connectors on the ends of the coax , not the old crimp type connectors.
For , coax , connectors , couplers , splitters and etc. , that are exposed to the outside weather and water.
Wrap with
http://www.coaxseal.com
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As always . trees and tree leaves , plants and plant leaves , have a Negative effect on broadcast Tv reception and so do buildings and other obstructions including your own roof and house in the directions of reception.
Digital Broadcast Tv tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do Double Rescan ,
http://www.wchstv.com/DoubleReScanAlert.pdf.