-31 June 1922: WNAC goes the air at 1199 kHz (250 meters). Owned by John Shepard III, of Shepard Department Stores. Operated out of one of the Shepard stores.
-15 September 1922: WNAC licensed and frequency moved to 833 kHz.
-1924: Frequency changes to 1080 kHz
-1925: WNAC sister station, WNAB, bows on 1200
-04 February 1925: frequency change to 1070 kHz
-1927: frequency changes to 850 kHz
-June 1927: WBIS on
-31 August 1927: WNAB becomes WASN
-18 September 1927: WNAC becomes one of the original 16 CBS network stations
-1928: Frequency changes to 650 kHz
-February 1928: WNAC combines with WBIS, also owned by John Shepard
-11 November 1928: As part of Federal Radio Commission's frequency re-allocation, WNAC moves to 1230
-28 March 1929: WNAC moves transmitter to Quincy. WNAC combines with sister station WBIS on 1230
-25 May 1930: WNAC forms Yankee Network and signs WNBH New Bedford as first affiliate
-March 1934: WNAC begins "Yankee Network News" (Yankee News Service), a 15-minute, hourly newscast
-1934: WBIS deleted
-05 August 1936: Colonial Network is formed, based at WAAB 1410 Boston
-27 September 1936: WNAC loses its CBS affiliation and briefly becomes an NBC Red affiliate
-26 January 1937: The station's licensee name is changed to Yankee Network, Inc.
-26 January 1937: WNAC and WAAB ownership consolidated under The Yankee Network, Inc
-19 December 1937: WLAW (owned by the Lawrence Eagle-Tribune) signs on.
-January 1938: WNAC runs some NBC Red Network and Mutual Radio, as well as Yankee Network
-27 May 1939: Shepard stores begins W1XOJ, a 20,000 watt FM station listed as "The Yankee Network" in Paxton, MA on 43.0 megaHertz. Become WEOD.
-1948: WGTR moves to 99.1 mHz
-21 May 1948: WNAC-TV 7 goes on the air
-October 1948: WGTR changes to WNAC-FM, moving to 98.5 mHz, with 10,000 watts.
-1949: WNAC joins Mutual Radio Network
-24 June 1952: Stations purchased by General Teleradio, Inc.
-17 June 1953: WNAC purchases WLAW of Lawrence, Massachusetts, and moves WLAW to 1260 kHz. WNAC moves to 680. WLAW FM license (93.7) returned. 1260 license was sold to WVDA, which became WEZE
-12 December 1955: Stations purchased by RKO Pictures, Inc, as RKO Teleradio
-January 1957: RKO Teleradio renamed RKO General
-1960: WNAC-FM 98.5 became WRKO-FM, simulcasting WNAC full-time
-26 February 1967: WNAC ends news-based Yankee Network
-13 March 1967: WNAC becomes WRKO, and changes format to Top 40
-01 January 1969: WRKO-FM upgrades to stereo, becoming WROR, breaking away completely from WRKO.
-01 May 1982: WNAC 7 in Boston was first station sold becoming New England Television's WNEV
-1990: WNEV owner buys radio WHDH, and forms WHDH 7
-1991: WRKO/ WROR sold to Atlantic Ventures, which became American Radio Systems and merged into CBS
-1992: WHDH radio sold
-June 1993: WHDH TV 7 sold to Ed Asnin
-02 January 1994: WHDH tv drops CBS for NBC
-August 1998: WRKO 680 sold to Entercom