PBS
Pbs Learning Media: Radio Transmission
This interactive activity from A Science Odyssey tracks the journey of a sound wave from the moment a musician sings into a microphone until his voice reaches the vibrating speakers of an AM Radio.
Other
American Public Media: Prairie Home Companion
This site from American Public Media offers the opportunity to listen to "A Prairie Home Companion with Garrison Keillor" shows and also presents trivia about the show, writings by Keillor, and other related materials.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Radio Waves & Electromagnetic Fields
Manually or computer generated, students can test radio waves being transmitted from a virtual radio station to a home. Study the curve, vectors, electric field, and more.
Other
Voice of America News: Vietnamese Language Edition
Vietnamese language edition of Voice of America broadcasts and online articles. Covers both world news and news about Vietnam. There is also a Special English section where non-native speakers of English can read and listen to the news...