The rectangular 6 pin connector for the Antenna Auto Tune connection used on the TS-2000, TS-50S, TS-480, TS-570, TS-590S, TS-850S ACC4, Turbo Tuner, LDG K-OTT and many more. Mating connectors/pins also available for making cable extensions. Contact me off line at: w3frg1 at gmail.com