CCTV security camera video signal is usually transmitted using Siamese Cable, which is a combination of RG59 for video and a pair of 18-gauge cables, in one jacket, for power. This design makes it so that you only need to run one cable for each camera. CCTV Siamese cable is good for runs under 700 feet. For longer runs, consider using Cat5E cable with Video Balun connectors.
Source: Apexcctv.com
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