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this is a great write-up on how to check the signal.
Thanks for the link, Pauly. If it turns out that the signal is not strong enough, my next question will be about why it's not strong enough, so I'll ask my next question now. 
One of the 4 lines I have connected to my amp is a very old one, installed originally by Rogers some 20 years ago. The cable is very rough in several places (I wrapped it with electrical tape where I noticed it) with the possibilty that the shielding has been breeched and, in order to get it to reach, I used an in line extender fitting (two female ends). Could a "bad" line like that cause a signal degredation in all 4 lines? How bad an idea is the in line connector fitting? Thanks again.
If you saw potential problems with a coaxial cable, then it would be wise to have it replaced. Coaxial cable is not expensive at all, and if its not possible for you to change it out yourself, call up rogers they may not have any issues to replce it either.
The older grade of coaxial cable (RG59) itself is no longer used and can pose a problem on higher frequencies, plus the fact its deteriorating is another problem, and a bad inline coupler or bad f-type connectors are also potential problems, and yes they can induce noise into your cable line and affect not just the one tv but all of them too.
