It would not be difficult to "ground" a test cable, that can likewise be moved. To be passed underneath rods mounted above them on a platform. If I took the time to assemble such a test, would the rods move? Or would they need to be held in human hands, as Art now says ?
You want to see it work see it in real time not some little set up tabletop experiment........... I have used bent coat hangers and utility marker flags with flags removed, have also used Bic pens with insides removed to hold wires as well...