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Monday, April 6, 2026

Harsh lesson about wind load, magnets, and "metal" surfaces

UHV-4

Over the last few months, I've been participating in Parks on the Air (POTA) and Simplex Saturdays (sponsored by TARA) and the antenna I've used is the Comet UHV-4, a quad-band antenna that works with my FT-8900 radio (10m, 6m, 2m, and 70cm).

It's a great antenna, and it's nice to have one antenna to rule them all, but one disadvantage is that its profile is not the most conducive for magnet-mounting. It's heavy, even somewhat top-heavy, and has a high profile for windy conditions. Most of the time I've owned it, I kept it indoors, or stored in my shed, taking it out to operate on Saturdays.

Admittedly I can be lazy, and thus was the case three weeks ago (as of this writing) when I last operated Simplex Saturday/POTA. I came home and simply left it on my Dodge Durango in anticipation of operating the next weekend. Unfortunately I was unable to do that, so I left it on the roof of the Durango as the weather was fairly pleasant, if not a bit chilly, but little precipitation occurred.

Last Wednesday (25 February) I went to Morristown for a SKYWARN Board meeting and simply left the antenna atop the roof. I didn't bring my radio (although I considered it) and it turned into a blustery day and I didn't think much of it as the temps were in the 50s. and it was relatively nice.

On the way home I took the interstate and was traveling westbound into an eastern wind. At one point a stiff gust hit and I heard the noise I never expected...*THUD* *THUMP*, and looking in the rear-view mirror I saw a flailing coaxial cable trailing. 


Other cars around me must have seen the hilarity ensuing and allowed me to move over to the shoulder. And when I got out, my worst fears had come to pass. The only thing remaining was the shell of my tri-magnet mount, with the coax adapter where the antenna once stood sheared right off. Whatever remained of the antenna was now about a half-mile back and destroyed. 

I had purchased the antenna at the Dalton Hamfest the year prior. And what a coincidence...guess what  event was the following Saturday!

I now had a mission for the Dalton Hamfest: To get a replacement UHV-4 and magnet mount.

So why not get a more "permanent" mount for my UHV-4? It's complicated, but in short, I have the quad-band radio mounted to my battery box, and so it's portable, and sometimes I take my vehicle to participate, and other times, I use my wife's car. So I need to be able to remove and attach to either car.


So I went to Dalton last Saturday and picked up the UHV-4 (thanks to ChattRadio for holding one back for me!) and a larger and (hopefully) stronger magnet mount for continuing to do POTA and Simplex Saturdays. Tower Electronics had the mount and connector for the UHV-4.

Unfortunately I was not able to get up on a mountain for Simplex Saturday that day but was able to get up on the Parkway a couple of weeks afterwards.



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