Well I removed my stock radio on my '95 Cherokee and can't seem to find where this ground wire goes to, can anyone help? I don't see a spot for it on the back of the radio and I didn't see where it was connected.

The middle wire

You might want to wait for someone more familiar with it. I'm pretty confident you can just attach it to the radio it's self. On one of the screws. Ground is ground! Mounting it in a metal dash it would all be connected anyway...The outer of the antenna cable grounds it as well.

Well I grounded it to the body of the stereo and everything still works

Cool....it seems the more better grounds the better. That outer coax helps with interference. In my signature, there is a deal there for the instrument ground written for the earlier Jeeps. Funny things happen when more than one thing share a ground that isn't grounded well. Then the "other" thing is actually seeing current from it's ground side from the first one.

Put some Ravi Shankar on a cassette player with a bad ground and compare them. Yours sounds better!