"Antenna and Wave Propagation" by KD Prasad is a valuable resource for anyone interested in learning about antenna theory and wave propagation. The book provides a comprehensive coverage of the subject matter, with clear explanations and detailed mathematical derivations. While it may have some limitations, the book remains a popular choice among students and professionals in the field. With the PDF version available for free, it is an excellent resource for those looking to learn about antenna and wave propagation without incurring significant costs.