The author explores in detail the key problems in starting a search for
extraterrestrial signals, the programs that have failed and those that
continue. His book is the first book that treats electromagnetic
frequencies besides RF and Microwave as possibilities for signal
sources. The book includes the fundamental considerations and the
physics of the necessary laser, UV, IR and RF technologies, as well as
coding and information theory considerations. It explores future
possibilities providing the reader with a comprehensive view of the many
ways signals from aliens could be sent and explains why the search using
RF leaves more than 99% of the electromagnetic spectrum unexamined. The
book also demonstrates the many parts of the electromagnetic spectrum,
considering the next likely steps in this unique enterprise. The ideas,
concepts and approaches are clearly explained without the use of complex
maths or physics.