It's
a 1991 Mercury Tracer. Hey!, it's a lot newer than most of my radio gear!
After some head scratchin', I decide to fabricate a mount that bolted between the (plastic) bumper and the frame (sic) of the car -- using one set of the three 14mm mounting bolts found on each side of the bumper. There was already a 1/16" plate inserted between each bumper mount and the frame - probably to provide a flat(ter) surface for the plastic bumper to bolt down on than the uneven surface of the vehicle. Removing this and slipping in my new mount, only increased the "protrusion" of the bumper by 1/8".
This is Version 0.9 of the mount and I re-did it to raise the platform another 5/16" to reduce the big depression seen on the lip of the bumper under the trunk lid.
The 2M trunk lip mount you see here will be moved to the other side of the trunk.
Not easily seen here, or in the other pictures, is a slit piece of plastic tubing that goes over the bumper lip -- under the antenna mount. This prevents the antenna mount from chaffing/scuffing the bumper. (Hey, ya gotta protect the re-sale value of a 1991 Tracer!) The Olde Scrounger used the pick-up tube out of a plastic spray bottle found in the trash.
As shown by the yard stick, the platform is a wee bit over 2 feet off the ground.
The
mounting bracket was fabricated from 3/16" steel. The platform,
itself, is 5" wide and sticks out from the trunk lip 9". It clears the
bumper - to the rear - by 4". 
