nothing like the internet! "during WWII, a retired vice president of UL, Herbert G. Ufer developed it for the US Army.....a cheap earthing system that consistently outperforms typical ground rod installation....developed it for grounding bomb storage sheds.....rebar is in the concrete foundation which is more conductive than all but the best soil...tests confirmed stability...many of his findings are detailed in IEEE Transactions paper #63-1505....so ....the way to install a Ufer is use a piece of 20' rebar, bend it up on the end (the above ground connection), tie wrap the encased portion of the bar to the other rebar grid-work and you have a Ufer that is far superior to most other grounding systems.