Radio Beam Guides Girls in Blindfold Race (from the Sep, 1934 issue of Popular Science.) The ancestors of Blast Theory and other networked performance artists?

Five blindfolded in a foot race, guided only by the beams from a radio beacon set up on the campus. Each girl carried a receiving set and wore earphones through which the guiding signals were heard. The signals transmitted were of two kinds like those used to guide planes on commercial airways, one indicating to the contestant that she was following the true course and the other telling her that she was wandering astray. The girls had little difficulty finding their way to the spot where the transmitting antenna had been temporarily set up.