A simple but efficient way to easily control a Magnetic Loop Antenna. The heart of the controller is the ESP32 microcontroller. A TB6600 stepper driver is used to drive a stepper motor to rotate either a butterfly, or vacuum variable capacitor. A rotary encoder is used to manually tune the capacitor but when SWR Bridge is selected from the Main Menu, full semi-automatic tuning is achieved by keying the transmitter and pushing the "tune" push button. The ILI9341 2.8" 240x320 Touch display is used to control all functions of the controller. Note: This controller does not require any specific cables to interface to a radio, as such it will work with any radio right out of the box.