It kind of depends on what antenna you get, but I'm sure that instead of
putting the antenna on the roof you could either attach it to the hood
somewhere, or even on the bottom metal corner of the windshield where
the hinge bracket is. Or any other magnetic surface for that matter.

The best location for the antenna is out in the open somewhere but even
that doesn't always matter. I've had success with putting it on the
parcel shelf in a car under the rear window and it still functioned just
fine. So, hell, you could possibly even get it to work sticking it on
the roll cage under the soft-top, but I've never tried that.

Brandonb