The book examines the diffraction of electromagnetic waves on bodies larger than wavelength. Approximate and rigorous research methods are developing. The results shed light on the nature of such phenomena as Fresnel diffraction, shadow radiation, backscattering depolarization, the process of edge wave formation, etc. The book is intended for radiophysicists and radio engineers, as well as for university professors, graduate students and students when studying antennas, radio diffraction and stealth technologies to create objects invisible to radars.