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

The grounding requirements for an amateur radio tower or antenna are primarily established by local electrical codes. These codes are developed by local jurisdictions and are enforced to ensure that electrical systems meet safety standards, which include proper grounding techniques.

Grounding is critical for both safety and performance; it protects equipment from electrical surges and lightning strikes, and ensures a good RF ground for the transmission system. Local electrical codes will usually dictate how grounding systems should be installed, including the materials and methods used, to ensure compliance with safety and performance standards required by the locality.

Though the other options address various aspects of tower operation and safety, they do not specifically dictate grounding requirements. The FCC Part 97 rules set standards for amateur radio operators but do not contain detailed electrical installation guidelines. FAA regulations chiefly concern the safe operation of aviation and do not address grounding for amateur radio equipment. Similarly, UL recommended practices provide safety standards but are not legally binding like local codes. Thus, local electrical codes are the primary source for establishing proper grounding practices for amateur radio installations.