I got a GRE P/N: 30-0028 800 MHz rubber angle antenna included when I
ordered my PSR 500 scanner on EBay. The extra antenna was a freebie thrown
in with the sale. The problem is that it will only screw on halfway. The
stock OEM antenna fits perfectly. But this folding antenna will only screw
on halfway just a little shy of the point where the antenna base pins would
normally drop into place. It doesn't matter if I push down on the antenna
while screwing it on, it just won't fit.

Is this a common problem or just a one off exception? I was thinking of
selling it, but I don't want to pass on my problem to someone else.