Use a spudger or tweezers to pry the three AirPort antenna cables straight up off of their sockets on the AirPort board, and bend them up and out of the way.

The cable connection points are very fragile. Be careful to lift only on the connector, and not on the socket or cable.

To reconnect, align the connector carefully into position over the socket, and press it down firmly with the flat of your spudger.