A cable cutter (10) for an aircraft (27) comprises an electrically-conducting body (12) configured to be mounted on an aircraft (27) and to cut a cable and an electrically-conducting auxiliary member (38) attached to, and electrically isolated from, the body (12). The body (12) and auxiliary member (38) are configured to together form an antenna. A method of manufacturing an antenna for an aircraft comprises the steps of providing a cable cutter (10) for an aircraft, the cable cutter comprising an electrically-conducting body (12) configured to be mounted on an aircraft (27) and to cut a cable; providing an electrically conducting auxiliary member (38) and attaching it to the body (12) so as to be electrically isolated from the body (12); and providing an antenna connector (42) and connecting the terminals thereof to the body (12) and auxiliary member (38) respectively.