Excellent work, and thank you for the additional info. There is a frys here in town, I will take a look. I am trying to mount a Yaesu ATAS 120A,
http://www.universal-radio.com/catalog/hamhf/45470450.html
The ATAS-120, on the bottom, emulates a PL-259 ("UHF") connector, so the mount needs to emulate an SO-239 (female) "UHF" connector. Suitable mounts are available from any Yaesu dealer.
The down side of this antenna is that it doesn't appear to have any flex in the mounting, no springs etc. so it will be tricky to be sure and not hit something with it. It will certainly need to come off during off road adventures.
I don't want to have something on the plow hitch, so options are fairly limited.