Seventy years ago this month, the March 1949 issue of Radio Electronics magazine carried this depiction of the state of television in the United States.

According to the magazine, in the previous year, TV was rampaging across the nation.  While a year earlier it had been confined to a handful of cities, it now had a foothold nationwide.  46 million Americans were within range of a station, and the magazine predicted that an additional 25 million would have access before the year was over.