Transmission by long-distance cable and repeaters using a vestigial-sideband carrier is becoming standard practice in television. The paper describes some factors affecting the performance of coaxial cables in such an application. A brief description of the inherent properties of a typical coaxial cable and their effect on system design is given. The main part of the paper describes an experimental programme for evaluating the irregularities of coaxial cable, and an estimate is given of their effect on television transmission. It is found that the most probable magnitude of the distortion from this cause is lower than the distortion from other causes.