removing Iroc antenna

On the used fender, there's still an antenna stalk and the enclosure on top of the fender, I needed the top part to start with but how do I take this all out?

One other thing, this isn't a power antenna, which I have on my car, so I might not be able to use the thing, just tell me how to get it out. Thanks.

The top black part is metal and it screws off, end of story.

there is a tool with 4 points to match the lock disk. otherwise with a pair of needle nose pliars it can be done as well but if you slip you will either scar up the lock plate or scratch the fender so be careful.