In order to properly measure the impedance of Earth", one must first measure from a ground rod driven to an 8' depth into the Earth and one driven to an 8' depth driven into the Moon, and one driven to an 8' depth driven into Mars. Now we have a good 3 point system from which to measure the impedence of the Earth. Its the impedance of space which will get you every time. It is over 25 ohms.
