As a -->Test<-- to prove reception.
Connect a New loooong coax to the antenna and run the New loooong coax through a open door or window direct to 1 Tv.
The connection that is part of the antenna must be clean and Ok.
If reception is Ok , then replace the outside coax and ground block.
DO NOT use boots , boots Do Not keep water out.
Boots -->Hold Water In.
To keep water out of the coax and to keep water out of the connectors and to keep water out of ground blocks and to keep water out of ect. .
Use
http://www.coaxseal.com.
Use
http://www.grainger.com/4YT86 Graing...T86?Pid=search.
If water has gotten in to the ground block , replace the ground block.
Yes<-->water can get into the inside of coax.
Yes water can get into the inside of -->etc. .