Which of the following establishes grounding requirements for an amateur radio tower or antenna?

Physical station construction, specifically regarding electrical safety and grounding, is governed by local electrical codes. While the FCC sets the rules for operating frequencies, bandwidths, and power levels, they do not dictate local building standards. Most local municipalities adopt a version of the National Electrical Code (NEC), which contains specific guidelines for grounding antennas and towers to protect against lightning and electrical faults. You must always check your local building and electrical codes before installing an outdoor antenna or tower. Distractors such as FCC Part 97 rules or FAA regulations are incorrect here. The FAA is only concerned with tower heights and lighting for aircraft safety, not the grounding of your electrical system.