Lynn Poole displays a section of coaxial cable and shows on a map the 67 U.S. cities using this and microwave relays to service 109 television stations. Dr. M.E. Strieby, Director of Demonstrations for AT&T, explains the two ways to carry television programs: by coaxial cable and transcontinental radio relay. He tells how coaxial cable works and shows an amplifier, Bell Labs radio tube, and other electronic devices used in television transmission. Using a phototransistor, electromagnetic wave generator, crystal detector, and a phonograph, Dr. Strieby experiments with various materials to show how microwave signals can be disrupted, reflected, and polarized. Photographs show the lenses of a microwave system and typical metal and concrete relay towers with television transmitters and receivers.