To minimize exposure, what distance from the HF antenna should personnel maintain during HF operation?

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

Answer: (A)

Keeping personnel at a safe clearance from a transmitting HF antenna is about using distance to reduce RF exposure. The power and energy emitted by the antenna weaken as you move away, so a defined separation provides steady protection against the fields, even when the transmitter is active at higher power or with duty cycles that increase exposure risk. For this setup, six feet is the chosen minimum clearance. It gives a practical safety margin that keeps exposure within permissible limits for typical HF operation, without making operations unnecessarily cumbersome. Being closer would raise the exposure, potentially approaching or exceeding safe limits, while being farther away would reduce exposure further but isn’t needed for standard procedures and could hinder work. The six-foot distance therefore balances safety with operational practicality and aligns with the recommended HF safety practice.