Hi GreyWulf,
That's a tough question.. there is no doubt the best antenna for long distance is the 102" steel whip spring-mounted in the center of a reflective metal plate like the roof of a car or truck or the center of the trunk lid on a car..
But while that would give the greatest range, it also gives the worst appearance you can imagine. I'm talking down right UGLY looking.
So where do you want to mount your antenna? ... roof, trunk lid, windshield, fender, pass-glass, etc..
With pick-up campers that extend over the truck roof a lot of people mount the antenna on the front fender, using an antenna mounting bracket to prevent drilling holes in the fender and the cable is easy to run through the fire-wall and into the dashboard area.
For my personal choice if I wanted the best distance and have it look nice on a pickup truck or car I would go for a magnetic base "Base Loaded" metal whip model. They are usually between 20" and 28" tall.
I don't like the fiberglass models because they tend to "weather" and turn into an ugly and painful shaft that puts "splinters" in your hand or arm every time you brush up against it.
and stay away from the "Center Loaded" style as the top part has a bad habit of vibrating loose and falling off.
I would place the magnetic base antenna in the center of the roof of your car or truck and run the cable through a door jam or window if you cannot find a way to run it into the car another way.. or if you mount the antenna on the trunk lid of a car then simply run the cable between the hinged back of the lid, through and under the back seat, then under the floor mats and mount the radio on the "Hump" in front of the front seat so it will be out of the way and readily accessible when driving..
I like the magnetic base antenna best because it can be easily removed and placed inside the vehicle when going through a car wash or/and to prevent it being stolen if you park in an area that makes you feel uncomfortable.
There are several mirror-mount models as well as windshield "ribbons" and "pass-through" window antennas and they all work pretty good but the distance/range won't be as great.
Hope this helps,
John