I’ve had a great many problems with the MX-6707 ‘round’ AMU that replaced the MX-2799 (usually due to the effects of weather/ moisture contamination) but have yet to have a single issue with any of the MX-2799s.   The only problem of course is that the lower section of the whip is quite difficult to find vs. the AS-1730 antenna system whip lowers, and they seem to have dried up entirely over the last 15 or so years and were very hard to get hold of even prior.

From: [email protected] <[email protected]> On Behalf Of MilComm Guy
Sent: Wednesday, June 5, 2024 1:09 PM
To: [email protected]
Subject: [MRCA] M151A2 Commo #3

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.