During the interwar years, broadcast radio became a popular way for Europeans to consume local, national, and international news. The medium not only began to shape European policy and politics, but also laid the foundation for European unification and global interconnectedness. In Europe On Air, Suzanne Lommers has documented the rich and often underexposed history of broadcast radio through the lens of international European relations. She specifically explores the roles of Radio Moscow, Radio Luxembourg, Vatican Radio, and the International Broadcasting Union as institutions that played an important role in national identities and establishing standards for broadcasting. The radio also offered new opportunities to politicians, who seized upon a vibrant and more direct way to communicate with their constituents. Essential reading for scholars of technology and European history, Europe-On Air reveals broadcast radio to be a technology that revolutionized international relations during the brief respite between the chaos of war in Europe.