Originally Posted by thefermanator
It is also a filter for the optic sensor to prevent interference from other devices with it. My suburban has one on it.
Ding Ding Ding! we have a winner!
It not to prevent interference with your radio, it to prevent interference with the optic sensor. Muy high frequencies in those lines, a stray signal could really screw the pooch!
I'd make sure to run one.