[TowerTalk] Grounding HDX-555

[EZ Rhino]

Jim Sez:

Bond your copper grounding wire (which comes into the concrete through the top)to the rebar cage. or run 20 feet of the copper wire around through the concrete, as long as it's totally encased.

I ask:
What difference does doing the above make when the tower itself is already set in the concrete, whether it be literally in the concrete (like setting the first section of 25g in the hole) or the anchor bolts set 3' into concrete for a crank up tower?

Chris
KF7P