The Comets used to just pull up. You should see a spot a couple of inches up from the mount where the body of the antenna will move. Give it a yank and it pulls. There is a spring holding it down so it takes a little effort. Now be aware that at some point Comet changed the design so that it takes a turn, either to unscrew the hinge or maybe a sleeve or collar. If that's the case then look for some sort of knurled section. I haven't seen this up close since my Comet is old and doesn't have the fancy new hinge, it's just a pull and fold. But at they wear, the old style ones can get loose and will start flopping over on the highway, so they changed the designed.