“In this book, Campbell demonstrates in a very convincing way how people in Germany integrated new technologies in their daily lives and thus came to terms with a technical modernity between the 1920s and the 1950s. … The book is impressive, putting the development of the radio hobby in the context of societal, technological, political, and economic changes during an important period of changeful German history—a must-read for understanding the genesis of today’s mobile and connected society.” (Christian Henrich-Franke, Technology and Culture, Vol. 62 (2), April, 2021)