I have a Polaris Ranger and run a VHF mobile radio in it.
I looked at the available options for antenna mounts. Most were overpriced and used low quality Chinese NMO mounts/cable. I chose to build my own.
I used a roll bar light mount and fabricated an NMO mounting bracket out of some 1" wide aluminum bar stock. I used a surface mount NMO mount that I took off a Laird magnet mount.
You can get the UTV antenna mounts from places like Racing Radios, Rugged Radios, etc. Problem is they use the cheap Chinese mounts. That might be fine for some, but it's not my style and I have the stuff to fabricate my own mounts.
Here's a link to them from Rugged Radios. I think they are WAY overpriced...
Easily mount your antenna to the roll cage! This Antenna Bar Mount allows you to mount your antenna to any vehicle with 1", 1.25", 1.5", 1.75", 1.8" or 2" tubing. Works with 3/8-inch NMO style antenna cables only, not NMO-MT-3/4. The billet mount provides easy and adjustable options for...
www.ruggedradios.com
You can get the UTV roll bar light brackets a lot cheaper:
Get a —QUALITY— NMO mount, not the Chinese crap. Stick with Laird, Larsen, etc. Tram, Browning, and any name you cannot pronounce are usually poor quality and have poorly installed connectors.
Avoid the temptation to use the NMO fender mounts. They are thin metal and won't stand up to the beating.
And as
@ladn said above, you need to have the right antenna. The roll bar mounts often won't make a good ground connection, and the offset nature of the mount results in a poor ground plane (if it even has one…). I'd recommend going with a 1/2 wave style antenna, they'll tune up without a ground plane. That'll save you headaches.
I'm running a 1/2 wave VHF antenna with a spring base. I think it's a Laird. I've had it on my UTV for about 3,000 miles and it has been through some pretty rough stuff. I've hit tree branches at 40mph and even have a permanent kink at the end of the whip. The coil/mount/spring is still in good shape. One of the areas we ride has some low underpasses under railroad tracks/highways where the UTV barely clears the overhead. I've had the whip bent over a full 90º right at the spring with no issues.
You can try the Cheap Chinese stuff, but the money you'll save at the start will quickly get lost when you need to keep replacing antennas. But then again, if all you do is putt around slowly on nice smooth trails, it might be just fine.