If you have the Ethernet Version of the Duet 3 Mini 5+ you can skip this step.

Be careful when handling the antenna, especially the connection with the board is very sensitive and you should avoid putting any strain on it.

Unscrew the antenna carefully from the wire and keep it for later use. You can keep the antenna connected to the board if it is already connected.

Remove the nut, the washer and the locking washer from the thread as well and keep them for later use.