There are a number of such very small antennas sold into the VHF-HI land mobile service.
I suspect you haven't found many ham reviews because few hams need that short of an
antenna, and can get a quarter wave whip for much less.
Larsen makes a line of antennas less than 4" tall in the 150 - 175 MHz, though each model
is only rated to cover a 2 MHz range, and they don't have one for 2m.
The Laird antennas are tunable over 142 - 160 MHz, with reasonable gain (or at least
not too much loss), but don't say what the operating bandwidth is at any one setting:
http://lairdtech.thomasnet.com/viewitems/vehicular-mobile-radio-antennas/phantom-antennas?&bc=100|3001622|3001654|3001655
I expect the bandwidth is similar to the Larsen, but it would be worthwhile finding
out from the manufacturer.
There are other ways of building very short antennas. The mos common is the DDRR,
which is often known commercially as a "blade" or "IFA" (Inverted F Antenna). These
also can have a wide tuning range but relatively narrow bandwidth once adjusted. A
ham version of the DDRR was marketed as the UNtenna for a while: I have a mag
mount version, but one that goes on an NMO mount would be much more efficient
due to the high currents flowing to ground. I've also made my own DDRR about 2" high
using copper pipe, and have some round brass sheets on hand to try an improved
version some day.
If you want a REAL low profile antenna consider an "annular slot". This could be cut
into the metal roof, or on a printed circuit board that fits into larger hole in the
roof. It adds ZERO height, unless you need to add a waterproof coating over
the top of it. That's what the FCC monitoring sedans used so there was no
visible antenna on the car - it was built into the roof. Gives you vertical polarization
without any vertical height. But that's probably more effort than you want.
On the other hand, a thin quarter wave wire or piece of adhesive copper foil tape
(as is used for burglar alarm systems) running up the center of the windshield
and fed against a couple ground radials or the vehicle body would not add any
height or require any modifications to the vehicle, and it would be cheaper.
