RG58 50 Ohm Coax by Amphenol -- The World's 2nd Largest Cable Maker and Inventor of the Popular BNC Connector - Our RG58C/U coaxial cable assemblies provide an affordable link for low-power RF applications over short runs. Common uses for RG58 coax include Thin Ethernet, mobile and base antenna installations, amateur radio, and communications patch bays. Pre-terminated RG58 cables feature Genuine Amphenol impedance-matched BNC or SMA connectors.