When to use: Use to calculate total coaxial cable attenuation for DAS trunk lines, BDA donor/server cable runs, antenna feed lines, and any RF distribution system. Attenuation increases with frequency and length — a critical factor in passive DAS design. Includes connector loss. Use the result as cable loss input in the Link Budget and EIRP calculators. For DAS trunk lines, LMR-400 or 1/2" Heliax is standard practice.