sywv cable (sywv Wire) Full Name: physical foaming polyethylene insulated cable TV system, commonly known as TV antenna, an RF coaxial cables are suitable for closed-circuit TV surveillance and engineering, fiber optic cable systems and HFC - Coaxial cable network to transmit data, voice and image signals. sywv cable structure: tinned copper braid shield. Physical foaming coaxial cable is a semi-air-insulated coaxial cable, oxygen-free copper wire inner conductor, insulation made of polyethylene foam to make it through the physical constitution of each tiny pores closed. Strong bond between the insulation and the inner conductor.