Feeder cables are coaxial cables used to connect tower or roof mounted antennas to active equipment or user devices located inside the building or communications hut.
Most RF transmission cables found in building risers and in tower cable trays are considered feeder cables. The vast majority of feeder cables use fully shielded corrugated outer conductors due PIM requirements in modern mobile communications systems. Entry-level braided cables such as LMR-400 can still be found in simple building repeater installations.