Hi Junior,  if you test a loop, you are going to see a short, because it
is, at DC, wich is what you are testing with a meter, but it does not
look like a short to the radio, or you would hear a great differents in
noise level etc, when you screwed the connector, aas aposed to just
plugging in the center pin!

HTH:
J.
John Jacques
Amateur Radio Station: KD8PC
"Where Cat Is,  Is Civilization!"