It is, essentially, a spin-off of Broadcast Engineering magazine, which began publication in 1959.
[1] In time, the common lineage of the two magazines was less important, and the connection was not understood by many readers.
[1] The March through August 2002 issues of Radio magazine have a small "BE" in the upper corner.
[1] Between November 1921 and February 1947 a Radio magazine was published on the west coast in either San Francisco or Los Angeles.
The publication was highly regarded at the time, carrying articles from many of the top men in the craft.