Ok... im getting ready to install a roof mount wilson 1000 on a jeep grand cherokee.. i have a sun roof an thetes a electrical thing mounted in the cener under headliner. does the antenna have to be dead center on the roof for best ground plane? Or can it be back a few inches from the center? also i doubt ill use all the coax so should i run as much as i can between roof and headliner or string it along all over the vehicle (down pillars an under dash)