My FM radio wasn't working all static, and then I saw there is no antenna a few days later! There is just a base so many someone broke it off, or stole it? Is this easy to fix?

 

Yes an easy fix just buy an OEM one and replace it then plug it into the radio.

 

It's right there with you! Is it broken or unscrewed? Should be as simple as screwing in a new one.
Out of curiosity, what year is your Cherokee?

If he base is there then it should still be connected, sounds like just the antenna is gone.

 

This is what is left. Can you buy just the screw in part?
Has it been cracked off or screwed off ? I didn't see threads.

 

Stick a coat hanger in there until you can go get one of those rubber flexible antennas.

Yours probably just broke down in the base, then fell out.

 

Threads are down inside.