Seventy-five years ago, this crystal set experimenter was pulling in a station, even though he was in a congested radio area, and even though there was another strong station very close to it on the dial. He was able to do this thanks to the crystal set shown in the November 1945 issue of Popular Mechanics.

The set featured two tuned circuits to give it such good selectivity. It was mounted on a chassis made of wood, and the two coils were mounted below the chassis. They could be wound on cardboard tubes or on wooden dowels.