Buy on Amazon : br br Yaesu ATAS-120A 40 Meter through 70cm Auto Tune Motorized HFVHFUHF Antenna For FT-857D FT-450DandFT-897D br br For The Following Yaesu Amateur Radio Models - FT-857D FT-991 FT-897D FT-450D FT-450AT FT-450 FT-100D FT-100 FT-857 Only br Covers HF thru UHF Self-Tuning motorized Transceiver Mobile Antenna 40 Meters through 450Mhz br Designed for mobile automotive use and Requires an Optional Suitable mobile antenna Mount coaxial Cable br Has PL-259 PO M style base thread overall length approx 5ft max br Motorized trombone section lengthensshortens to tune antenna when Yaesu radios tune button is pressed