LDG Electronics AT-1000Pro automatic memory antenna tuners have an auto mode that automatically starts a tuning cycle anytime the SWR exceeds a limit you set. Also, there are provisions for two antennas--you can switch between them anytime you need to. For each antenna, there are 2,000 memories that store tuning parameters for almost instantaneous tuner setting whenever you transmit on or near a frequency you've used before. Just key and it tunes! The AT-1000Pro tuners will operate at any power level between 5 and 1,000 watts peak RF input. LDG Electronics AT-1000Pro tuners have a much larger, easier to read cross-needle meter with two selectable scale ranges (100 and 1,000 watts). Each control button has a built-in LED indicator, so you can see the tuner's status at a glance. The AT-1000Pro tuners will interface with many popular transceivers, enabling their TUNE button to control the AT-1000Pros' operation. Dedicated control buttons allow you to fine-tune capacitance and inductance, on those rare occasions when the AT-1000Pros can't find a perfect match by themselves. The AT-1000Pro tuners will tune from 1.8 to 54.0 MHz continuously and will match an amazing range of antennas, from Yagis and dipoles to inverted Vs and slopers--virtually any coax-fed antenna from 6 to 1,000 ohms impedance (16-150 ohms on 6 meters). Tuning time is usually under 6 seconds. If you're transmitting near a frequency with stored tuning parameters, the tuners will set those parameters in under 0.2 seconds. Longwires or antennas fed with ladder line require an external balun. LDG Electronics AT-1000Pro tuners also include the necessary cables for DC power and radio interface, so you're ready to operate right out of the box!