First, remove the plastic plug as shown in the picture:
Next, remove another plug:
These plugs are very easy to get out. They're two pieces, one piece is inserted into the hole in the carpet, and the second piece plugs the hole. They can slide out if you just pull with your fingers. If you can't get it out, just slip a screwdriver under it
Almost done, the carpet should be mostly loose at this point. It's molded plastic so you'll have to tug on it a bit. There's one more plug that needs to be removed:
Tada! Carpet is free and you should be able to access the antenna. I've circled the general location of where it is. Remove the jack and the bracket and you're set!
There really isn't much to removing it. The trunk has a "lip" that comes down to help hold the carpet in just bend the carpet and pull.
