Naharlagun 
http://justmusing.net/2009/01/ Gli-01 Video Ground Loop Isolator
- BNC male to BNC female with mini cable 15 on both sides
- Passive, no power required
- Hi performance elimination of ground loop problem
- Low video loss, Bandwidth: 20 Hz – 11Mhz, +0/-3Db
- Prevents video-signal distortion caused by video ground loops
- Eliminates picture tearing, cross talk and rolling
- Prevents power cables laid by others interfering with the CCTV system
