CB antenna junk again

[PARAGON]

Ok, one for the techies, Beastmaster, a good one for you

So, I have a Midland CB with a Wilson 1000 antenna. Worked great, loved it. Now I have the Gobi stealth added and have run the antenna all the way to the rear (it's a magnet mount) with it resting on the roof of the truck. It's a base load antenna. I take the mast of the antenna off and on as required due to it's height

Now the Gobi is not really grounded, right? Should I ground the rack (even though the antenna is not attached in any way to it) or should I leave the rack relatively un-grounded?

I know there is some ground-plane BS stuff that I am supposed to think of but before I complete all of the wiring, I though I should consider what would be best for reception/transmission. BTW, the majority of the antenna mast is above the rack, there is a plastic coil or whatever that would be below the level of the rack.