Which is a proper grounding method for a tower?

An outdoor antenna tower acts as a massive lightning rod. To safely dissipate the extreme energy of a lightning strike into the earth, you must install a heavy-duty, low-impedance grounding system. The industry standard is to drive an 8-foot ground rod into the earth next to each leg of the tower. Each rod must be bonded directly to its adjacent leg using heavy wire or copper strap, and all the rods should be bonded together around the base. This provides a direct, highly conductive path for millions of volts to safely enter the ground. A single 4-foot rod or a household cold-water pipe connection is completely inadequate for lightning protection and could result in a house fire. Ferrite chokes are used to block RF interference, not to handle lightning strikes.