Contact , http://antennasdirect.com
About replacement parts.
Also , water in the coax and connectors and connections and couplers and coax ground coupler and splitters and etc. .
Will Cause reception situations of all types and kinds.
When water gets into coax , the coax is then , Trash.
All coax and connectors and connections and couplers and coax ground coupler , and splitters and etc. are suspect of being defective , outside and inside and every where else.
For a outside coax , use coax that has the Compression type connectors on the ends of the coax , not the crimp type connectors.
And to make Double Sure that water does not get in , wrap with , http://www.coaxseal.com
To prove reception one way or the other.
Connect a NEW Continues length of coax to the antenna and run the NEW Continues length of coax through a open door or window direct to 1 Tv.
Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.