The Madame Psychosis show
This aerial, low-watt, has been rigged by the station's EM-wienies to tilt and spin, not unlike a centrifugal theme-park-type ride, spraying the signal in all directions. […] The aerial, inclined at about the angle of a 3-km. cannon, spins in a blurred ellipse—its rotary base is elliptical because that's the only shape the EM-wienies could rig a mold for.
Context
The broadcast hardware: Madame Psychosis's voice flung citywide by a spinning ring on the brain-building's roof.