MFJ-936C – Deluxe High-Efficiency Magnetic Loop Tuner – Unicom Radio
HG3 QRO Stepper Mag Loop Antenna – PreciseRF
GitHub - WA2FZW/A-40-Meter-Magnetic-Loop-With-Semi-Automatic-tuning-by-WA2FZW: This project describes the construction of a homebrew 2-turn 40 meter magnetic loop antenna and the semi-automatic remote tuner for it.
A Remotely Tuned Magnetic Loop Antenna | Hackaday
Automatic Magnetic Loop Tuner – Smaller Enclosure Green Display – Golb.be – ON5IA