I too keep finding myself doing this too...

mxslick has some good advice there. I use RG-6Q for the simple reason its all I stock the truck with these days. Then a coulpe of connectors.
These: http://www.levitonvoicedata.com/catalog/BuildPage.aspx?BuildPageID=19

Then these: http://www.levitonvoicedata.com/catalog/BuildPage.aspx?BuildPageID=12

There are purists out there who consider every connection a severe loss of Db. And see every connection as >10' of cable. ( at a couple of feet I don't see it as a problem.) For them, Hals method would be better.

Mark Heller
"Well - I oughta....." -Jackie Gleason