Antennas on the truck are the MX-2799 for VHF, this is the early "shoebox" matching unit, it uses the same cables as the later unit and auto tunes, unlike the MX-6707 later round unit it does not have a manual tuning knob, auto tune only.  The lower mast section on the MX-2799 is unique, it uses the AT-1096 lower mast, you can tell the difference at a glance as the hex section goes all the way to the top, the AS-1730 lower section for the MX-6707 round matching unit is machined round at the top.  The upper mast sections are the same, so if you see a lower section at a show missing the numbers you will know how to ID it.