During an outdoor 2.4 GHz point-to-point bridge deployment, you must comply with the U.S. FCC limit of 36 dBm effective isotropic radiated power (EIRP). The access point's radio is configured for 19 dBm output and the coaxial feed line introduces 2 dB of loss. What is the highest-gain antenna you can legally attach without exceeding the EIRP limit?
EIRP is calculated as: EIRP (dBm) = Transmit Power (dBm) + Antenna Gain (dBi) − Cable Loss (dB). With a 19 dBm radio and 2 dB feed-line loss, the effective power at the antenna input is 17 dBm (19 − 2). To keep the resulting EIRP at or below the FCC-mandated 36 dBm for the 2.4 GHz ISM band, the antenna gain must satisfy 17 dBm + Gain ≤ 36 dBm. Therefore, Gain ≤ 19 dBi. An antenna rated at 19 dBi meets the limit, whereas anything higher (e.g., 21 dBi) would push EIRP above 36 dBm. Lower-gain options (15 dBi, 17 dBi) are permissible but do not maximize allowable signal strength.
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