It's been years since I attached the external Airport Antenna on my G5 Powermac and now that I want to remove it I want to make sure I don't inadvertently break anything. I tried rotating it counter clockwise to unscrew it but that doesn't seem to work. I also tugged on it a little and it didn't come off that way either. Can someone tell me if I should just pull it with more force or is it supposed to unscrew off?