Ed McMahon hosting NBC Monitor, 1965 to 1968

Monitor was a weekend radio program broadcast from June 12, 1955, until
January 26, 1975. It originally aired beginning Saturday morning at 8am and
continued through the weekend until 12 midnight on Sunday. The radio show 
offered a magazine-of-the-air format featuring news, sports, comedy, music and
celebrity interviews along with other short segments. 

New York Times ad for the first broadcast of Monitor Sunday, June 12, 1955.