sentences:  Radio waves have the ability to pass through the atmosphere, foliage, and most building materials, and by diffraction can bend around obstructions, and unlike other electromagnetic waves they tend to be scattered rather than absorbed by objects larger than their wavelength.The study of radio propagation, how radio waves move in free space and over the surface of the Earth, is vitally important in the design of practical radio systems.Radio waves passing through different environments experience reflection, refraction, polarization, diffraction, and absorption.