I have never seen one of those on a car. I wouldnt count on that working well either with such a small conductor. I assume cities would get on people for destroying the road if they tried to use a stiffer metal, and the drag associated with the device on the car, it would cause noise. You can buy all sorts of things to add to your car. It doesn't make them effective. This device would have to demonstrate its effectiveness against lightning or EMP for me to believe it. I am pretty sure lightning would destroy it, as that small conductor would melt, melting the rubber with it. That is assuming the small conductor sticking out of the rubber, hasnt been worn away, and you are left with a rubber strap with a conductor in it, insulated from the ground.' A semi-rigid, solid conductor, I could see potentially being used for this. One where it could maintain its shape always being forced to touch the ground. Those would become a service item, as they would wear, and bend / break with potholes, road breaks, bridge joints, steel sections on roads. Not practical... I just dont see this item being more than a placebo.