With the cover removed, we can see the antenna plate. This is held down with six Torx T6 security screws, which can be removed with the appropriate screwdriver.

Carefully moving the plate to the side, we get just enough space to expose the antenna coaxial cable held down with a grounding clip and another T6 screw.

With the screw removed, a Spudger can be used to dislodge the antenna plate. Alternatively you can use an Opening Tool for this.