Ok, here it is. This is my complete Radio setup. This is Offroad tested and took a HELL of a beating and Still rocks!!!! Also, I put a field strength meter in the cab for the 50 Yaesu 2M and the cab shields the passengers. It is effectively 10 watts inside the vehicle on 50 watts out.
And for the Distance question, I have always had this antenna mounted here and I can get an easy 50-75 miles on a Normal day here in Hampton Roads, and when I do travel, she does superbly on simplex going down the road. I can get almost a full 60 miles out of her.
Here's the Ground Wire for both radio's. 2M is ground off the mount screw on the mount.
This is under the passenger floorboard right next to the Transmission Crossmember.
The Diamond SG7900ANMO Dual Bander
This is the mount for the Ham Stick 10/11 Meter Antenna