Belden 1859A Video Triax PLENUM Cable RG-11/U Type 75 Ohms Featuring Kings BQ Triax connectors. Stranded 15 AWG Stranded Center Conductor. Choose the 1859A Series for as much flexibility you can find in a plenum rated triax cable, typically used in association with stationary cameras for easy pull installation. 1859A cable is the plenum version of the 1858A series.