ground loop isolator

Anyone have suggestions on how to get rid of static when streaming to a laptop with an SDS100 and audio cable from headphone jack (scanner) to audio in (Primary Sound Capture Device)? It's actually a distinct sound that I guess can best be described as static that I only hear when the device is...

I have tried sending feed thru several computers and am using a Ground Loop Isolator from Radio Shack. Plus I moved scanner to different rooms Still have bad hum in feed. Any suggestions? Help please. I figured if I can't resolve hum its not worth sending a feed.