Operation of the HF radio presents a radiation hazard to personnel within how many feet of the HF antenna?

• A. 3 ft
• B. 6 ft
• C. 9 ft
• D. 12 ft

Answer: (B)

Radiofrequency energy from the HF transmitter creates a hazardous zone around the antenna. To protect personnel, keep clear of that area during transmissions. Six feet is the established minimum safe distance for this system, because within that radius exposure can exceed safety limits while the HF radio is on. When the transmitter is not active, the hazard is not present, but during operation stay outside that six-foot zone. The other distances are either closer than recommended or unnecessarily conservative for normal operating power.