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Up high is a great place, at least it was in my full sized truck.

Yep generally speaking two antennas will give you a figure 8 pattern. That means your lobes will be to the left and right of the vehicle. It isn't so bad if you drive an 18 wheeler with lots of...

A dual antenna set up should come with a special coax harness. It would only work correctly with dual antennas. So just buy one mount, two antennas and 20 feet of the RG58 or better the mini RG8.

I was digging around trying to find that "figure 8" radiation pattern I was telling you about and a couple of things came to mine.

The two antennas have to have a certain separation. 9 feet I...

I don't. I used a ball mount and a 102" whip, but I'm doing the HAM thing.

Dual antennas, like the trucker's use, look cool but actually case a transmit and receive pattern that is better to the sides of the vehicle.

So it depends on what you want. Looks cool ok, works...