If the antenna is to tight to undo by hand, then use some pliers wrapped in a rag to keep from scratching it. If your wanting the whole assembly off, then once the antenna is off you can gently pry the base cover off, and then theres 4 screws looking at you. Take them out, then get inside the car, undo the antenna cable from the back of the stereo, then pull the whole assembly out from the fender, working the cable out from under the dash as you go.