Heathkit Antenna Tuner Model HFT-9 Amatuer Radio Antenna Match. Rated for up to 50 watts transmitter output power. Has a 4:1 built in balun for use with open wire feed lines. Made to match various antennas and impedance loads to your transmitter. Perfect for low power Amateur radio transmitters. Operates from 1,8-30 Mhz radio frequencies. Size is 6 1/2" x 2 1/2" x 5 1/2". The pictures are the actual antenna tuner being sold. Co-ax connectors for transmitter and antenna.