Well with CB, height is might as they say so starting down low isn't the best. That said I have seen the 1' or so windshield glass mount CB antennas work fairly good in the bush. They would likely screw on to a mount like the stock one if it even unscrews. There are multiple adapter pieces out there for that.
The short ones work good enough to rescue a lost broken down Jeeper in the middle of nowhere in the Canadian bush when we didn't even know he was there once. He was trying to find us on a run I organized and lost his rear driveshaft on the wrong trail when his recent spring lift shifted back on him. (re-used U-bolts eh) He heard us OK all around him, but only one of us could hear him back, the one with the antique 21 Channel boosted unit that happened to be closest to him anyway, so she sat on a hill and the rest of us spread out until someone else got close enough to pick him up direct. We found him fast then and got him back running fast.
That said, give me a 4' anyway, I have mine on the mirror arm and it works well. My old 21 ch CB also picked him up when I got close to the 'spotter' on the hill.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10. Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com
(10 new albums added Sept 16/10)