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Capacitance is affected by the cable length. Long runs can lead to high frequency signal loss and poor picture quality. Capacitance is affected by the cable length. Long runs can lead to high frequency signal loss and poor picture quality. The most common means of conducting video signals for cctv is coaxial cable. Not only is coax the most commonly used cable, but also the least expensive, most reliable, most convenient, and easily maintained way of transferring electronic images in a CCTV system. The most common type used is RG59/U, but this designation actually represents a family of cables with widely varying electrical characteristics. Other varieties like RG59/U are RG6/U and RG11/U; these are used predominately in CCTV and video work. The RG reference is the cable specification for use as a "radio guide ",while the numerical value helps differentiate the specifications of each individual cable. Common "coax" cable RG59U,RG6U, and RG11U is circular. Each has a center conductor surrounded by dielectric insulating material, which in turn is covered by a braid to shield against electromagnetic interference (EMI). The outer covering is the "jacket".