An improved control system for controlling radiation direction of an antenna beam of an antenna is disclosed. The radiation direction is adjustable by an actuating device influencing phase shifting means based on an actuating signal. The system includes filtering means, arranged for filtering out a control signal and being connected, in use, to a feeder cable arranged for carrying RF signals and control signals. The system further includes an external control unit including detecting means, arranged for detecting the filtered out control signal, and control means, arranged for producing the actuating signal based on the detected control signal. The filtering means is directly connected to the external control unit so as to provide the filtered out control signal directly to the external control unit.