Considering the desirable low radiation angle and resulting high gain from a Slim Jim type antenna, one would think that someone has mounted one in a mobile application. I've searched the net but can't find anything about mobile Slim Jims. In my mind at least, it would seem to be a fairly simple operation to design and mount one on the roof of a vehicle. Besides a change in SWR (which should be adjustable), in what negative way would it interact with the metal roof? Has anyone seen a mobile application of this antenna?