IMHO
Use solid bare copper wire to connect to the ground rods, #4 bare solid at min.
No need to tie each legs' ground radial together, they're already tied together
at the tower.
Polyphaser recommends 65-75 feet of ground radials per leg. With eight foot
ground rods this would be 5 ground rods per leg. I'd increase that over what
you're planning; don't cheapen your ground system at this point.
No need to tie the legs to the concrete; concrete is conductive so you'll get
that benefit.
And, I'm a staunch supporter of CadWelded connections for a fool-proof,
maintenance free solution.
You're on your way.
Phil KB9CRY
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