download:
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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 (all three maps are at the same scale):
Boswash
Chipitts
Sansan

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.