Which is a proper grounding method for a tower?

To properly protect a tower against lightning strikes, you must provide a direct, low-impedance path to the earth. The best practice is to drive a separate 8-foot ground rod into the earth next to each leg of the tower, ensuring the massive energy of a strike is dispersed as efficiently as possible. These rods must be bonded directly to their respective tower legs and also bonded to each other using heavy wire. Using a single 4-foot rod or relying on a cold water pipe provides inadequate surface area and creates potentially dangerous paths for lightning current into a home's plumbing. An RF choke is for managing radio frequency currents, not for handling massive lightning surges.