While I don't have an F150 I have used the bent steel brackets that bolt to the inside of the fender on several different trucks. I really like them. They are simple, sturdy, and fairly inexpensive. I use them because I have ladder racks on the work trucks and a roof mounted antenna would get hammered when loading the rack. However, on vehicle that I don't have ladder racks on I always just drill a hole in the roof. They look great and work the best by far. The last one I had done I took to a local two-way radio shop. They supplied the mount, drilled the hole, and ran the cable to the trunk for me. It cost all of $32 dollars. There's nothing wrong with a hole in the body, it's the best way to go. I hate magnetic mount antennas due to their paint scratching, and the ugly wire running across the body of the vehicle.
