Double Female RF Connector
This less than $5 device solved my problem. It's also useful for those who have several 8-10' cables, but need 15' to get the job done. This is another issue I battled with because the cable outlet was on the wrong side of the room. I needed twice the length one of my coaxials could provide. I used a double female RF connector to combine a couple of cables and create the length I needed.
Click the title to take a look at what I mean by double female RF connector.

