Frank Weed, who served as chief of the National Park Service's (NPS) Wireless Program Center, in a recent letter to park managers and staff that accompanied complementary CDs provided them, summarized the history of NPS use of TIS radio stations:

"Perhaps you are aware of the benefits of Travelers Information Stations in disseminating information to the motoring public.... Those stations are the low power informational radio broadcasts designed to reach the motoring public in the common AM radio band [530 to 1700 kHz].... Initially conceived and developed as an experimental broadcast medium at Yellowstone National Park in the early 1970s, the radio stations and the technology utilized have matured from frail tube-type transmitter equipment and audio tapes to totally reliable and fully solid state transmitter equipment with digital audio that can be recorded/re-recorded from a distant location via dial-up connection. Today, the National Park Service has over 175 of these broadcast units in operation nationally." ISS has, for years, proudly served as the Wireless Center's radio station supplier

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