The RFS RLKU78-50JFNA 7/8 in foam RADIAFLEX RLKU cable, A-series has a copper tube inner conductor and overlapping copper foil outer conductor. Features ultra wideband from 30 MHz – 2800 MHz for applications in tunnels and buildings. Low coupling loss variations. The flame retardant JFN Jacket allows this cable to be used in a wide range of applications.