A "radio tower" is a tall structure that is built to transmit and receive radio signals. It helps the radio signals travel over long distances so that people can listen to music, news, or talk shows on their radio devices. Full definition
You're required to reach out to them and build radio towers in order to access other continents and, ultimately, the story missions they have to offer. (heypoorplayer.com)
No longer do players have to climb radio towers to reveal parts of the map. (digitalchumps.com)
Far - field waves, such as those broadcast from radio towers, can travel over long distances. (sciencedaily.com)