Ok...they make a quarter wave style that looks like that, but I'd go with an NMO mount that looks like one of these (some pictured below come with magnet mounts):
http://www.tessco.com/products/displ...&subgroupId=34
This same website has the quarter-waves listed (3 inchers):
http://www.tessco.com/products/displ...&subgroupId=33
In most of the pics I've seen (and cars in person), they used the first style above. I have no idea why, and I only know enough about the radio stuff to get me into trouble. I'm sure it's some kind of gain v/s quarter wave mumbo jumbo.
