books.google.com - Decades before the Internet, ham radio provided instantaneous, global, person-to-person communication. Hundreds of thousands of amateur radio operators—a predominantly male, middle- and upper-class group known as "hams"—built and operated two-way radios for recreation in mid twentieth century America....http://books.google.com/books/about/Ham_radio_s_technical_culture.html?id=2ly7rDKeGZsC&utm_source=gb-gplus-shareHam radio's technical culture
