Pacer RG213U Coax Cable - Black - 150' [MRG213U-150]RG213U Coax Cable Black 150' Many industries, as well as individuals, use coaxial cable RG213U. Commonly, in the transmission of communications signals such as audio, video, or network signals. You'll probably recognize these cables if you've ever looked at the back of your cable box or modem. The name of these cables is actually coaxial, although many people call them coax. So, what does coax, or coaxial, mean? The term coaxial means that the cable