LDG RT-100 Outside 100 Watt Automatic Antenna Tuner, Tuner and controller. The RT-100 is a 100 watt coax in / coax out remote tuner designed to be placed near the feedpoint of the antenna.If you are worried about power loss due to SWR in your feedline, the RT-100 is the answer. Place the RT-100 near the feedpoint and the virtually eliminate all feedline loss due to SWR.The RT-100 is DC powered over the coax, so add your own DC injection circuit (bias-T) or use the optional LDG RC-100 to power and control the tuner from you shack. The RC-100 will provide DC power over the coax as well as control for Auto/Semi mode, Lock and force a Manual Tune.