For short runs, 2 feet, from rig to tuner or portable coax (25 feet) to antenna I use Belden RG-174 coax. I use the solder RCA phono plugs & use a RCA phono to BNC connectors. Small rigs & tuners handle better with the smaller coax & loss at HF frequencies with short runs is not enough to make any noticeable difference running 3 watts out. Reed W4JZ