Can't read to the pin if its's connected.
I assume what you meant was with both antenna and radio disconnected, you're reading pin to shield: open at one end, and shorted at the other?
Sounds like you have 2 problems: a shorted pin to shield somewhere, and an open (well, something: Shield to outer connector is probably most likely. Pin to center conductor is harder to screw up.)
You'll most likely need to guess and cut one off, and check the remaining cable, pin to center conductor on the cut end (should short), outer connector to shield on cut end (should short) and pin to outer connector on the remaining connector (should be open.) If it doesn't read correctly, you cut the wrong end. Finished cable should read the same, but substitute "pin" for "center conductor" and "outer connector" for "shield".
Or alternatively, you can simply cut and reterminate both ends, which saves all the troubleshooting.