ARRL Technician Practice Exam

What role do antennas play in RF safety?

1. They can increase RF exposure to operators

2. They inherently reduce RF radiation

3. They can be positioned to minimize radiation exposure

4. They must always be grounded for safety

The correct answer is: They can be positioned to minimize radiation exposure

Antenna positioning is crucial for minimizing radiation exposure, particularly in environments where operators may be close to the radio frequency (RF) energy being emitted. Properly locating antennas can help ensure that energy radiates away from people, thereby reducing potential RF exposure to individuals working nearby. Antennas that are placed at greater heights, or oriented in a way that directs their radiation pattern away from personnel, can effectively lower the risk of exposure. The other statements do not describe this aspect accurately. While antennas might increase RF exposure under certain conditions, they do not inherently reduce RF radiation. Grounding antennas is primarily done for protection against lightning and electrical surges rather than directly for RF safety, although it does contribute to overall system safety. Hence, understanding the strategic placement of antennas emphasizes the proactive measures one can take to ensure RF safety for operators.