I'm trying to connect an FM modulator between the stock antenna and the Harmon Kardon radio on my '09 Ultra. I located the plug where the FM antenna plugs into the radio. When I tried to disconnect it, the connector did not look like a typical antenna plug. There is what appears to be a plastic sleeve with 2 soths running th elength of the plug. There are 2 metal tabs filling in these slots, and the copper core lead in the middle. The plastic sleeve only pulled out so far. The metal tabs will pull out of the plastic sleeve, leaving the copper chord lead exposed and vulnerable to breaking. I don't want to screw up the plug trying to remove it (obviously), but I need to know how (or if) I can remove the connection, insert the signal output from the modulator into the radio, and connect the bike antenna lead to the antenna input on the modulator. Any help would be MOST appreciated.