Completely stopped the hum in our audio system caused by the cable TV connection. We no longer have CATV, hopefully you can use this. Apparently this is a common problem. Here is some information from Jensen:

"The Iso•Max VRD-1FF is a high performance capacitive based isolator that has been meticulously designed to break the ground loop that causes hum and buzz in audio and 60 cycle hum bars in video.

• Improves audio/video quality by reducing 60 Hz ground currents

• 2 MHz to 1300 MHz bandwidth spans VHF/FM/UHF/CATV spectrum

• Capacitive based design minimizes broadcast channel interference

• Meets FCC Part 76 Regulations for CATV systems

Housed in a compact cylinder and designed for use with RG59 or RG6 type cable, this second generation VRD-1FF employs a unique RF engineered solution that delivers a ruler-flat response from 2 Mhz to over 1300 MHz spanning the VHF/FM/UHF and CATV spectrum. The VRD-1FF’s exceptionally linear response prevents frequency dips that can cause channels to drop out in digital cable. F connectors are carefully machined to ensure true 75 Ω compatibility for optimal signal integrity while minimizing reflections and ghosting.

Plug and play easy to use, this passive solution doesn’t require any power. One simply inserts the VRD-1FF in series with the incoming signal and it quietly goes to work without degrading the signal. This makes the VRD-1FF a ‘must have’ for the AV technician that is servicing and installing digital cable as well as conventional CATV or VHF/UHF antenna or MATV systems."