R11+M, also called RG11 with messenger, stands for RG11 plus a messenger wire. The messenger wire is an additional wire attached to a coax cable, which is to add rigidity to the cable instead of carrying signals. This RG11 with messenger cable is specially used for satellite device and aerial cable installation because its extra steel messenger wire can give greater support to the RG11 cable and reduce sag. In addition, RG11 with messenger is perfect for very long runs or outdoor installation to ensure a stable signal transmission.
