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The Federal Communications Commission (FCC) governs radio communications in the United States. What is the maximum EIRP (watts) that a point-to-multipoint WISP link can transmit in the 2.4 GHz band?

A 4 watts.

For point-to-multipoint connections, wireless Internet service providers (WISPs) operating in the 2.4 GHz spectrum are limited to 4 watts of effective isotropic radiated power (EIRP). For the 2.4 GHz band, their point-to-point connections range from 4 to 158 watts. For the 5 GHz bands, the maximum EIRP is 125 MW.
FCC rules and regulations can be found at www.air802.com/fcc-rules-and-regulations.html.

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