Alan, I would say you want the rebar because a couple hundred feet of rebar is a lot better than 20 feet of copper. It makes the whole footer a ground electrode instead of just 20 feet. If we really thought concrete alone was a good conductor we would just be using a 20' wire in a pool.
BTW we don't seem to mind steel workers building our electrode when it is building steel
[This message has been edited by gfretwell (edited 12-12-2005).]
[This message has been edited by gfretwell (edited 12-12-2005).]
