In “Syndication,” Re-Imagined Radio samples shows produced by Mayfair Productions in the 40s and 50s for its latest episode, which premieres at 1 p.m. April 15 on KXRW-FM (99.9), Vancouver, and KXRY-FM (91.1 and 107.1), Portland. Alan Ladd, founder of Mayfair Productions, was best known for his 1953 movie “Shane,” frequently adapted for radio. Re-Imagined Radio will broadcast samples of “Box 13” (1948-49) and “The Damon Runyon Theater” (1949-51). Re-Imagined Radio premieres episodes on the third Monday of the month. More details are available at reimaginedradio.fm.