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Humm, I can look to see if the cable is touching the antenna wire under the dash some where which is possible since the antenna is on the same side of the truck as the computer. I ran the wire low across the front dash so it passes under the radio a good 6 inches at least. Due to the short length of the cable and the size of the truck, it's about impossible to run the switch to the drivers side of the truck without getting somewhat close to the radio though.
I do think your probably right on Ken and I'm betting that the cable is either touching or very close to the antenna wire somewhere under the dash right by the computer.
Also, you can take the cable and wrap a wiring around it from one end to the other with about 1/2 inch between each wrap. Then wrap another in the opposite direction.