4 foot ground rod with ground clamp. We suggest one 4 foot ground rod for energizers rated up to 1 Joule.
Energizers rated 1 joule to 3 Joules will require at a minimum 2 ground rods.
Note: we provide these ground rods as a convience. The cost to ship is about
$ 8.00, You can buy these at your local hardware store for about $12.00