TII 220 Ground Loop Isolator for Cable TV applications Prevents unwanted ground loop current on the shield of the cable, which can cause noise and degrades picture quality. Designed to work with today's high bandwidth CATV networks. Unit comes standard with "F" type Male-Female connectors. Unique In-Line design is impedance matched to 75 ohms and is virtually transparent to all analog or digital bi-directional signals transmitted from 5MHz to 1.0 GHz. Product shows superior RF performance operating at a frequency range of 5 - 1,000 MHz. Maximum insertion loss is 1.5 dB. at 1 GHz. Robust design includes a metallic housing that provides excellent RFI shielding of &gt; 85 dB. Housing is environmentally sealed against moisture and humidity.