I was at WHDH 850 in the early 1990s. VP/GM Dan Griffin had been hired away from WRKO by then WHDH owner David Mugar (who also owned channel 7-then WNEV). Dan began doing his magic at 850-and every ratings book WRKO dropped half a point or so, while WHDH went up the same amount. Dan created Clapprood and Whitley. Finally, there was but half a ratings point separating the two. After changing the channel 7 calls to WHDH-TV (instant credibliity) Mugar sold both TV and radio. TV went to Sunbeam who still owns it and radio went to Atlantic Ventures -owner of WRKO. Dan was so FURIOUS at how Mugar had lied to him (and he had hated working for Atlantic Ventures) that he got a new job and quit-not even telling Mugar where he was going (it was funny-Mugar's memo announcing that Dan was leaving said "We wish Dan well in his new assignment"). Of course we all knew where Dan was going-to be the VP/General Manager of WCBS 880 in NYC.
Atlantic Ventures GUTTED WHDH-moving Clapprood and Whitley, Ruch Limbaugh and also Howie Carr to WRKO-leaving a shell of a great radio station. They also fired most of the people responsible for the success of 850, including me. Through a shell company (owned by Peter Ottmar, but controlled by Atlantic's President, Joe something-he was best freinds with Peter they had formerly made a lot of money together in cable TV) they also controlled WEEI 590-and THEY changed it to sports. Finally the scam became known and Ottmar sold 590 to the Celtics-AFTER moving the WEEI calls and format over to 850. Later on they also bought 93.7.
Much later on Atlantic Ventures became known as American Radio Systems, and grew rapidly, until absorbed by CBS. Since CBS already had stations in Boston (both radio and TV) they had to spin off 3 of the original 4 stations (93.7, 850 and 680) and also WAAF, and Entercom bought them.
So now you know the true story.