Textbook in PDF format The increasing urban mode of life has touched the radio amateur hobby to a much greater degree than it has most other hobbies. Urbanization of the World’s population is growing very rapidly. At the start of the twentieth century only 14% of the Earth’s population lived in cities. Then, in the 1960's more than 50% lived in cities. Now, at the beginning of this, the twenty first century, more than 75% of the Earth’s population lives in cities. About The Author Acknowledgements & Author's Commentary Preface Invisible and Substitute Antennas Invisible Antennas High-Altitude Invisible Antennas Substitute Antennas Antennas for Special Bands or Freq. Antennas for 136 kHz Urban CB Antennas Special Antennas Underground & Spreading Antennas Making Antennas with Coax Making TV Antennas Work for Amateur Radio Multi-Purpose Antennas Other Publications