When evaluating RF site exposure, what percentage of the maximum permissible power density exposure limit must antennas have?

The requirement for antennas during RF site exposure evaluation is set to ensure that the power density levels do not exceed established safety limits for human exposure. In this context, the correct choice is based on guidelines that typically stipulate that antennas must not exceed 5% of the maximum permissible power density exposure limit for RF radiation.

This 5% benchmark serves as a guideline for precautionary measures, allowing for a buffer zone that accounts for varying environmental conditions and individual sensitivities. By ensuring that exposure remains at or below this level, regulatory bodies like the FCC prioritize public health and safety, minimizing the risk of adverse effects from RF emissions.

The other percentage choices reflect lower thresholds that do not align with established standards or practices in the field. The rationale behind choosing a specific percentage like 5% is to provide a practical level of exposure that balances safety with effective operational use, recognizing that most RF facilities can operate within these limits without compromising functionality.