The small radio antenna included with the radio antenna modules and some radio transmitter modules can be exchanged for this larger 868MHz HF antenna for receiving or sending radio signals in or from metal control cabinets. It is attached externally with a magnetic base and the 250cm long cable is fed inside. The best performance is achieved when it adheres to a metal surface with the magnetic base, e.g. on the FHM175 HF ground. The transmission and reception area is almost spherical around this antenna. The height of the antenna is only 10 cm. With SMA screw connection.