You know AM and FM radio. But did you know that there is a whole other world of radio surrounding us at all times? It’s called shortwave — and, thanks to a quirk of science that lets broadcasters bounce radio waves off of the ionosphere, it can reach thousands of miles, penetrating rough terrain and geopolitical boundaries. How did this instantaneous, global, mass communication tool — a sort of internet-before-the-internet — go from a utopian experiment in international connection to a hardened tool of information warfare and propaganda?

The Divided Dial is hosted by journalist and Fulbright Fellow Katie Thornton. Her written articles and audio stories have appeared in The Atlantic, 99% Invisible, The Washington Post, BBC, NPR, WNYC, Minnesota Public Radio, The Guardian, Bloomberg’s CityLab, National Geographic, and others. She is a lifelong radio nerd who got her start in media as a teenager, volunteering and working behind the scenes at radio stations for many years. You can follow her work on Instagram or on her website.

The Divided Dial was edited by On the Media's executive producer, Katya Rogers. With sound design by Jared Paul. Jennifer Munson is our technical director. Art by Michael Brennan.

With support from the Fund for Investigative Journalism.

On the Media is supported by listeners like you. Support OTM by donating today (https://pledge.wnyc.org/support/otm). Follow our show on Instagram, Twitter and Facebook @onthemedia, and share your thoughts with us by emailing onthemedia@wnyc.org.