The 1950s and 1960s were the Golden Age of Shortwave Radio when the
bands were crowded with all kinds of strange signals.
Radio manufacturers promoted their products, upon request they mailed out huge eye
catching brochures printed on glossy high quality paper. -see above from the early 1960s
"Your Guided Tour of the Amazing World of Short Wave Listening" was a  
mult-page brochure from the late 1950s.  The Space Age was in its infancy, as
this brochure shows a space theme with the oscilloscope pictures of the
beeping signal that was radioed back to earth by the Sputnik satellite.