When evaluating RF site exposure for sites with multiple transmitting antennas, antennas with more than _______% of the maximum permissible power density exposure limit must be included.

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When evaluating RF exposure at a site with multiple transmitting antennas, you focus on the antennas that can meaningfully affect the exposure at that location. Only antennas whose potential contribution to the exposure exceeds a small threshold are included in the assessment. The standard threshold used is five percent of the maximum permissible exposure limit. So if an antenna could deliver more than five percent of the MPE at the point of interest, its contribution must be included in the exposure calculation; antennas contributing less than five percent can be omitted from the detailed sum. This approach keeps the evaluation practical while ensuring that the major sources of exposure are accounted for. The total exposure from the included antennas is then combined to verify it stays within the regulatory limit.