How to I access the rear antenna to check if the cable has become dislodged?

CD player works fine. I am getting no AM or FM reception. I learned there is a fuse in back of the radio; but I assume that if the problem was the fuse--I would not be able to play CDs. I also learned there is a radio amplifier--could this be bad---or could the cable have come loose? Thanks for your initial response.

I actually just did this and reconnected my antenna. On the left side of the trunk is a panel you can access to get to the antenna, drop top mechanisms, modules, and rear lights panel. If you open that up, you can just reach in all the way to your antenna to see if there is a wire connected to the bottom, if not (like in my case) just under it should be the wire hanging around, it has a skinny head and plugs in like a male into the antenna and screws in.