Just unscrew the mast from its base. You can usually unscrew it by hand, but if needed, you can use pliers to loosen it. Take off the rear garnish molding at the back of the headliner and also the rear quarter trim panels. Pull down the headliner at its rear end for access to the antenna's base. Unscrew the antenna base nut and disconnect the cable to separate it from roof panel. To install it again, perform them in a reverse order of removal.