Cindylou101,
I have to agree with all of the above comments.
Coaxial cable is a funny thing, if not sealed properly, moisture from the air can move up the cable by mere capillary effect.
On any outdoor connectors I use 3M self-amalgamating tape as well as a drip loop.
This is your first defence against moisture.
One other thing, that can tell you if there has been water under the jacket is the fact that the coaxial screening will turn white and there will be a slight powdery residue at the entry point.
