What stations are subject to the FCC rules on RF exposure?
All commercial stations; amateur radio stations are exempt
Only stations with antennas lower than one wavelength above the ground
Only stations transmitting more than 500 watts PEP
All stations with a time-averaged transmission of more than one milliwatt✓Correct answer
Explanation
Amateur stations are not exempt as a class; the rules exempt an RF source only if it meets a stated criterion, and the lowest of those is a maximum time-averaged power of 1 mW regardless of separation distance. Practically every amateur transmitter is above that figure, so the exposure rules apply. Note that the pool wording is a simplification: a source above 1 mW may still be exempt under the separation-distance and ERP criteria in the same rule.