Review on Jabinco 20pcs Clip-on Ferrite Ring Core Noise Suppressor Cable Clip Set for Various Diameter Cables - Black by Joe Gosa

I am a radio amateur (ham radio) installed a new antenna and with high power (approx. 900 watts) removed the picture from the television by 20 meters. I installed a couple of these on the power cord of the set top box and it solved the problem right away. No more problems with TVI! I also had quite a bit of hum from my computer speakers and subwoofer at 15 meters (21.0MHz). I put one on each speaker wire and power cord and the background was reduced by 50%, added another on each speaker wire and power cord and now the background is 100% gone! A wide range of RFI chokes in the package, very easy to install and very competitively priced.