When to use: Use to estimate the coverage radius of a single antenna for DAS design, antenna placement planning, and in-building coverage checks. Uses the log-distance path loss model with a propagation exponent (n) suited to the environment. Enter EIRP from the EIRP calculator and the minimum required RSSI (−95 dBm for NFPA 1221). Coverage area = π × radius². Divide total floor area by single-antenna coverage area to estimate antenna count.