interesting. this just screws on? how do u remove the old one , simpy grab with wrapped pliers and twist, or more involved? I ask as I seen someone on here doing something with antenna and they had roof liner away from roof . thanks

also if this is aluminum like the one mentioned above the mangowalk , found on ebay shipped for 13.94. I wonder what could be different except the little painted on Perrin name :/ aluminum is aluminum.