The free-standing radios of the middle decades of the 20th century were invitingly rotund and proudly displayed--nothing like today's skinny televisions hidden inside "entertainment centers." Radios were the hub of the family's after-dinner activities, and children and adults gorged themselves on western-adventure series like "The Lone Ranger," police dramas such as "Calling All Cars," and the varied offerings of "The Cavalcade of America." Shows...