Leaky feeder coaxial cables are a special category of coaxial cable designed for internal and underground communication in buildings. They can utilize signals at different portions of the cable's length, thus allowing for juxtaposed radiation and reception along the whole length. As such, these cables penetrate freely over long distances. In this way, these cables are used in transport tunnels, industrial cabins, and in multi-story buildings to allow for unobstructed communication.