Professor wrote:
 Jeff is right... while the whip is a great antenna... if not mounted
 on the center of the vehicle... it will be very directional towards
 the front of the vehicle if mounted in the rear. Frankly, the whip is
 a bit impractical from several standpoints. When balancing
 practicality and performance... I always opted for a somewhat shorter
 antenna (Wilson 1000) magneted to the center of the roof. This
 provides an excellent radiation pattern and doesn't hit every tree,
 bridge, and lighting fixure... LOL
 Professor
 www.telstar-electronics.com
But the whip makes such a nice "BONGGGG" when you hit the right object.  ;-)
That being said, I think the Wilson is the better choice. If he's driving a
Plymouth he'll probably have the same problem I had with my '68 Dodge
Coronet. Thin top "skin". I'd worry about that whip ripping right out.
Jeff
 Great price but if you don't use the center of the roof you will be
 highly directional. Why not put the hole in a less obtrusive place
 like the top rather than the highly visable side of the vehicle?
 Everything will be easier if you use the roof mount. Tuning, etc.