>A 1" hole 100" deep, filled with concrete is not a concrete encased electrode.
Yeah, but it has to be at least as good as a rod driven into rock.

>isn't the rod suppossed to be in direct contact with "soil"?
Say, '66, you'll have to drive your ground rods in a different state. They have to be in soil -- not rock!

>try 45 degrees.
Right. It's a little harder to hit; but easier to get up to. But I never drive a rod straight. If I'm on a slope, I angle with the slope.