@shuttersparks @kilroy_was_here As someone who was taught be the graybeards of 1990 on how to mitigate CRT acrcing-induced failures in video amplifiers, I can attest to using the copper tubing. Skin effect would drive the current to the outside of a rod or heavy wire. Braid is nice, too, but both are spendy due to copper prices. A flat conductor of any kind will minimize inductance, and that is more important as the ground wire length increases.