Abstract: An antenna carrier (10) with an antenna (14) for electromagnetic radiation to be fastened to a wall (1) of a container composed of steel plate and having ventilation openings (5) which are covered on the exterior side of the container wall (1) by a cover (3) which protects against sprayed water, and which forms a cavity (6) in front of the ventilation openings (5), in which the cover (3) is composed of plastic, the antenna (14) projects through a ventilation opening (5) into the cavity (6) formed by the cover, the antenna carrier (10) is fastened on the interior side (9) of the container wall (1), and the antenna carrier (10) is the ground reference surface of the antenna (14) and is constructed as a magnetizable metal plate (11).

Abstract: An antenna carrier (10) with an antenna (14) for electromagnetic radiation to be fastened to a wall (1) of a container composed of steel plate and having ventilation openings (5) which are covered on the exterior side of the container wall (1) by a cover (3) which protects against sprayed water, and which forms a cavity (6) in front of the ventilation openings (5), in which the cover (3) is composed of plastic, the antenna (14) projects through a ventilation opening (5) into the cavity (6) formed by the cover, the antenna carrier (10) is fastened on the interior side (9) of the container wall (1), and the antenna carrier (10) is the ground reference surface of the antenna (14) and is constructed as a magnetizable metal plate (11).

Abstract: The watching apparatus is provided with a radar probe, and is made such as to detect the presence of human beings. The radar probe includes a command unit and a branching element, inserted between an oscillator circuit and a transmitter stage, as well as a superposing circuit (5), in which a signal, derived from the radar transmitter, is superposed with an echo signal received by a receiver stage. The radar probe is made such as to work as an interference radar, and a delay circuit is inserted into the transmitter-receiver path between the branching element and the superposing circuit in order to increase the travelling time of the radar signal with respect to the branched off signal.