The antenna pictured (Larson NMO2/70B) is the one I want. I just want to be able to make it work on the roof of the car as my first option. I can go as far as 15 inches away from the other antenna and put in on the passenger side of the car. Will the 15 inches in distance be workable? If that option is not workable then I may go to the fender mount. Then glass mount as last resort.