Disconnect the negative battery cable, then work under the dash to unplug the antenna cable. Use a small open-end wrench to unscrew the antenna mast, followed by removing the cap nut and lifting off the upper adapter and gasket, taking care to avoid scratching the fender with needle-nose pliers. Next, work under the vehicle to remove the three plastic rivets from the rear edge of the inner fender splash shield and pull the shield away for access to the antenna. Detach the antenna from the fender and remove it from the vehicle, with installation being the reverse of the removal process.