This paper focuses on the transmission of wireless telegraphy between Ústí nad Labem and Teplice during the German Universal Exhibition in Ústí nad Labem in 1903. Though this was not the first transmission of wireless telegraphy in Austria, as some newspapers claimed, it was probably the first transmission of wireless telegraphy over a large distance presented to the public in Bohemia. The idea of presenting wireless telegraphy at this exhibition was promoted by Wilhelm Biscan, director of the Elektrotechnikum school in Teplice at that time. The telegraph was installed by the Allgemeine Elektrizitäts-Gesellschaft in Berlin. The device used the Slaby-Arco system.