In the beginning, there were ABC, NBC, and CBS, and they were good. Midcentury American man could come home after eight hours of work and turn on his television and know where he stood in relation to his wife, and his children, and his neighbors, and his town, and his country, and his world. And that was good. Or he could open the local paper in the morning in the ritual fashion, taking his civic communion with his coffee, and know that identical scenes were unfolding in households across the country.

Over frequencies our American never tuned in to,…