Hum interference filter, insulator, with galvanic and capacitive isolation of the inner and outer conductor. Sheath current filter for capacitive and galvanic isolation of coaxial cables effectively prevents interference and hum due to ground loops. It is suitable for use with cable TV and DVB-T plus radio antenna systems, but not suitable for satellite receivers. Frequency range is 5 to 1006 MHz with continuity attenuation of 2 dB. Connections include IEC socket and IEC plug.