I hung a KAT-1 (Marine Grade Kenwood Automatic Tuner) on the rear cap and feed it with a TS-2000 Works great with assorted long wires or push up poles. Lots of options.
A screwdriver could also be mounted on the rear as you suggest, while not the best antenna, it is perhaps the best MOBILE antenna. If you are worried about ground plane you may be able to extend a frame rail out just a bit using basically one bolt and a bit of custom cut angle iron, (No drilling required save on the extension rail) This would give you the frame as a counterpoise.
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