I made one out of a scrap piece of 1/4" x 3" x 3" aluminum angle I had laying around for my son's Jeep. It just uses the outside upper tailgate hinge (to body) bolt to hold it on. The raised parts on the top and bottom of the hinge hold it straight. Here's a couple of pictures of the bracket with just a couple of pilot holes in it (one for mounting, and the other for the antenna) before I drilled them to size. We counter sunk the mounting hole and used the original bolt, and just spray painted it black.