The National Broadcasting Company (NBC) was formed by
by the Radio Corporation of America (RCA). It is the oldest
major broadcast network in the United States. The network
began broadcasting with a gala four-hour radio program
originating from the ballroom of the Waldorf-Astoria Hotel
in New York City.
 

Original Run: November 7, 1932 to March 28, 1947
Network: CBS Radio Network (1932-1936) Mutual Broadcasting Network
(1939-1940 and 1946-1947)

The Buck Rogers show was the first science fiction radio program. It aired in
four separate runs with varying schedules, initially as a 15-minute show on a

Monday through Thursday schedule. 

The radio series of Gunsmoke first aired on CBS on April 26, 1952 with the
episode "Billy the Kid", written by Walter Newman. The show ended on June
18, 1961. It starred William Conrad as Marshal Matt Dillon, Howard McNear
as Doc Charles Adams, Georgia Ellis as Kitty Russell, and Parley Baer as
Dillon’s assistant Chester Wesley Proudfoot.

William Conrad and Georgia Ellis

Conrad (right) talking with the sound effects man

Cast and crew going over the script for an episode of Gunsmoke

Howard McNear, William Conrad, Parley Baer, and Georgia Ellis

Roy Rogers, Dale Evans and Trigger

Roy Rogers (Leonard Franklin Slye) (November 5, 1911 – July 6, 1998)

Rogers was one of the most popular Western stars of his era. Known as the
"King of the Cowboys", he appeared in over 100 films and numerous radio
and television episodes of The Roy Rogers Show.