This ad ran in the June 8, 1950 edition of the Orange Review. Fulton Lewis Jr. was a popular newscaster on the Mutual Broadcasting System.
At the height of his popularity he was heard on 500 stations with an estimated audience of 16 million. Click this link for more on Fulton Lewis, Jr.
WJMA was a Mutual affiliate from sign on in 1949 until about 1958.