Teachers have explored the use of radio in the classroom almost since radio technology entered into the mainstream of society, yet radio remains a relatively unused mode of instruction. This Digest describes several radio applications and summarizes various radio activities to assist teachers in integrating technology into the curriculum. Discussion includes teaching the history of communications; hands-on geography and language arts activities using AM-FM radio; international shortwave radio broadcasts; National Oceanic and Atmospheric Administration (NOAA) weather service broadcasts; scanner radios; practicing communications skills with amateur radio. A bibliography and list of Web site resources is included. (AEF)