The Coaxial Cable RG11 with Messenger from brand ETC is a Coaxial Cables. Coaxial cable or coax cable are an indispensable element of Hybrid Fiber-Coaxial Network (HFC). It is a type of electrical cable that transmits radio frequency (RF) signals from one point to another. Usually the coaxial cable is made of 4 parts: copper core, dielectric insulator, metallic shield, and plastic jacket. There are a few types of coaxial cable with different uses, some are suitable for residences and others for commercial projects. .