Lucky me I’m at my airplane and can take pictures!
So the antennas on the tail take signals from the ground station along the runway and convert it to deflections of the vertical and horizontal needles on the instrument (course deviation indicator or CDI) keeping both needles in the center keeps the plane along the center of the radio beam and on path to the runway. Think of it like flying down the center of a flashlight beam and you won’t be far off.
Modern GPS systems can also generate this data and display it the same way.
There are also non-precision approaches that require greater visibility as they do not provide the direct path to the runway, just get you low enough in the right place to hopefully see it.
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