Bill - That's exactly where I am talking about....I didn't realize the point had such notoriety. My boot was in ok condition, but I don't think it provides a tight seal around the cable any longer....it looks a little loose. I have a new one I could put on there, but of course there is no way to get it on there with disconnecting the cable. I have some stuff called Coax Seal that I am going to put on there, and I might even cut off that boot before I do as it would be a much better seal. I put it on all the coax connections on our roof antennas (on our house), and in the few instances where I have had to remove it to disconnect a cable, the connectors look like new, despite the salt air we have from the ocean and the intense UV here in SoCal. Highly recommended stuff, and it's not expensive.
http://www.coaxseal.com/
Someone on eBay usually has it pretty cheap. You would only use 1 strip for this application. Here's a listing for 10 strips for $3.50 delivered.
http://cgi.ebay.com/Coax-Seal-10-pieces-/190468134256
Dave