The LDG AT-600ProII is a versatile tuner capable of handling up to 600 watts on SSB and CW, 300 watts on RTTY (1.8 – 30 MHz), and 250 watts on 54 MHz. It boasts LDG's advanced Switched-L tuner technology, enabling quick matching of various coax-fed antennas such as Yagis, dipoles, inverted vs, slopers, and loops. With a tuning range from 10:1 SWR down to 1.5:1 in just seconds, it also supports long wires, random wires, and ladder line-fed antennas with the addition of a balun. The tuner features two antenna ports, separate memory banks for each antenna, LED bar-graph meters for RF power, SWR, tuner status, tactile feedback control buttons and an LED bypass indicator.

Equipped with a maximum power output of 600 watts on SSB and CW and 250 watts on 6 meters, the LDG AT-600ProII offers a user-friendly experience with its easy-to-read LED bar graph display for RF power, SWR, and status. It comes with 4,000 memories for seamless band changing, a two-position antenna switch with dedicated memories for each position, and a tuning time ranging from 0.5 to 6 seconds for full tune and 0.1 seconds for memory tune. The tuner also includes a built-in frequency counter for memory operation, covering a frequency range from 1.8 to 54.0 MHz and supporting 6 to 800-ohm loads (16 to 150 ohms on 6 meters). Additionally, it is suitable for various antenna types like dipoles, verticals, beams, or coax-fed antennas.

The LDG AT-600ProII is compact and lightweight, measuring 10.5D x 8.5W x 2.5H inches and weighing 3 pounds. It operates with a power requirement of 11 to 16 volts DC at a maximum of 750 mA during tuning, ensuring efficiency and convenience for users. The tuner also has an included DC power cable, making it a comprehensive solution for antenna matching needs across different frequency ranges and power levels.