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Yes you should earth it. If nothing else to help prevent damage from lightning strikes and associated static charge buildup if you're in a risk area.
My concrete has copper+aluminium 25mm diameter lightning rods in it (bonded to the reinforcing), exposed with terminals on the outside. Those terminals are then earthed to copper in the ground. Then the steel structure is earthed also (less of an issue as it's embedded in the concrete).
Roger.
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