How to Connect Two Coaxial Video Cables Together to Extend the Cable Lengthby Kirk Bennet
If you need to connect a coaxial video cable to a device and the cable isn't long enough, you can use a second coaxial cable to extend the length. Using two shorter cables to create a longer one is cheaper than buying a longer cable; plus, the cable you'd purchase would likely be shorter than the cable made from two shorter lengths. The two cables can be connected quickly and easily using a coaxial coupler.
Purchase a coaxial coupler (see suggestions in the Resources section).
Connect the first coaxial video cable to one end of the coaxial coupler.
Connect the second coaxial video cable to the other end of the coaxial coupler.