This book explores the physical processes involved in the propagation of radio waves through various environments, including waveguides, volumetric resonators, slow-wave structures, ferrites, free space, and near the Earth's surface. It presents experimental data on the radio-physical properties of the Earth's surface, the troposphere, and the ionosphere. The book also examines the unique characteristics of radio wave propagation across different frequency ranges. Designed for third- and fourth-year students, it caters to those studying in the fields of "Design and Technology of Electronic Devices" (specialization 211000) and "Radio Engineering" (specialization 210400), both full-time and part-time programs.