I have 2 Jeeps an 08 unlimited and a 14 Rubicon unlimited, both have ham and business band radios in them. I'm in the coastal bend area of Texas and in my area we talk a lot of 2m simplex, very seldom use a repeater, we are also pretty spread out. After going through Numerous antennas and setups in these two Jeeps as well as those I have had in the past I think I finally have the 2014 setup where it works the best so far. I use the Arizona Rocky Road antenna mount above the rear tire, I have found 3 different antennas that get me the best 2m simplex coverage two are actually dual band ,one mono. I use the yaesu FT-2900 in the jeep with 75 watts, and have a 165 watt amp that I use at times but not all the time. All but one of our group use this radio at home and mobile.
The first is the Diamond SG 7500NMO, it is the shortest on the three antennas I use
and still does well simplex, I usually have this antenna on when I know I will be leaving the area where our ranch is and heading into a non rural area, Daily base to mobile 20 to 35 miles simplex not a problem, with 15-20 mobile to mobile, but not crystal clear.
The next is a monoband, the Diamond NR-22L . This one is long, around 98 inches,
and it is my daily use antenna when I know I am going to be around the ranch or just in the local area. It has a uhf type mount ( don't like them but all it comes with) so I use a good adapter to NMO, and it goes on the same mount above the spare. With this antenna I'm told my signal goes up 2 -3 bars on a ft 2900 meter, to the same 20 to 35 mile distant bases. Mobile to mobile I have a solid signal out to 22 miles under all but really bad conditions. This antenna also gets a signal thru better in lower areas and around trees and heavy brush than the other mentioned.
The third ,and the latest antenna that I am trying is the Larsen 2/70 , only had it back there a week and it is doing pretty well. Not quite as good as the long diamond, but seems to be adequate for daily use, and it will hold up Very well just because of it's design. I won't fear tree limbs etc as much using it for sure. As I spend more time using it I will revise the report .