These maps represent three areas of the United States predicted by Herman Kahn and Anthony Wiener in 1967 to become megalopolises by the year 2000. These areas — Boswash, Chipitts and Sansan — are coastal regions whose boundaries are revealed here by the borders (and border-crossings) of US hertzian space.
See the entire series at Bill Rankin's radicalcartography.net
Colors show type of broadcast:
AM Radio 535—1705 kHz
FM Radio 88.0—108.0 MHz
Television 54—72 MHz 76—88 MHz 174—216 MHz 470—608 MHz 614—698 MHz
Data from the FCC and NOAA; broadcast bubbles current as of 2006—2007.