I believe you just unscrew the knurled ring.

 

True, but it doesn't come out easily. That was my problem and it's quite easy to mess it up.

 

If the cable got pulled out of the screw on connector it should be able to be replaced pretty easy. A CB Radio or electronics type shop should be able to crimp a new one on there. We replaced them by the hundreds on the old school installed cell phones.

Edit: If you want to try to repair the one that is there, take the connector off and put it back on the cable. The big thing to watch is that none of the strands of the braided shield touch the center conductor. You can try to tape it up or heat shrink it but it's a band-aid at best.

 

I may try a repair. There's just a very thin conductor that terminates into a banana type plug. There isn't a braided shield. It almost looks like I pulled the insulation on the conductor back when I removed the plug exposing an extra inch or so of conductor.

 

From the year that you listed, The radio must be the H/K radio.
My advice is to call Iron Cross Radio and talk to them about the antenna connections.
I have found them to be stand up guys and will help any rider with the H/K radio.
They can also let you know if they can improve the radio and if shop repairs are required, their work is very good and reasonable cost.

It costs nothing to try to get information. They know the H/K radio.

 

Thanks. I'm familiar with them. Good suggestion.

 

That turned out to be a great suggestion. I emailed them this morning and they just got back to me with all the information I need.
MKguitar, they pretty much said what you posted on running dual antennas.
Thanks to all that replied and a big thumbs up to Ironcrossaudio.com