I usually just tie the ground and center conductor together somehow (e.g., clip leads) and use an ohmmeter at the other end (home run location) to see which cable is "shorted". If you have an F-81 (barrel) connector and a 75-ohm termination load then ou can easily use those for cables that have the male connector already installed. This technique only works reliably for cable runs with no splitters, etc., and of course you can only test for one cable at a time this way...