The GB464-UTP Ground-Loop Blocker for Twisted Pair wire is an active device used in conjunction with any Unshielded Twisted Pair video transmitter or "Balun" to eliminate Ground Loop Interference and picture quality problems in new and existing twisted wire CCTV video installations. The unit is installed at the monitor site where the video twisted pair signals come together, or at any intermediate point where video signals are monitored. The GB464-UTP operates with any standard CCTV, NTSC or PAL video signal.