to 97.1 MHz., which had been the home of NBC's WYNY. Emmis sold the 103.5 frequency to Westwood One, which also acquired the WYNY call letters and its country music format. As it had before when it took over the frequency formerly belonging to WHN, WFAN inherited broadcast rights from WNBC as WFAN to this day operates under WNBC's original license. The switch to 660 AM added the New York Knicks and New York Rangers to their lineup along with the Mets, who moved down the dial with the station. In the end, WFAN retired two of the oldest radio call letters from the dawn of commercial radio: WHN and WNBC. The WFAN era After the switch As Don Imus had already been the morning show host at WNBC, WFAN left his program in place when they took over the frequency. WFAN's original morning show on 1050 was hosted by Greg Gumbel; his was a straightforward sports show, but it was not doing well in the ratings. At the time of the switch, sports talk radio was still an untested format with questionable prospects, and the idea was that bringing on board a host who appealed to a broader audience would get more people to give the station a try. WFAN also benefitted from having Imus's fans - who were used to tuning into 660 kHz on weekday mornings - in place to listen to other shows. WFAN instantly took advantage of its Imus inheritance; for example, it featured a special live monologue by Imus character "Billy Sol Hargus" from Shea Stadium moments after taking over the 660 frequency. Imus slightly altered his show for his new employer, adding sports updates and replays of last night's big plays. Discussions of sports stories that crossed over to general interest were also featured on the program, although Imus also kept many of his regular comedy bits that were not sports-related. Initially, WFAN aired sports news and score updates every 15 minutes (at the quarter-hour), but by 1991, began doing updates every 20 minutes (at :00, :20 and :40 past the hour). These updates, called 20-20 Sports Flashes, are now considered an industry standard. Additionally, in a nod to the former WNBC, update anchors often end their top-of-the-hour updates with the catchphrase "And that's what's happening ...", which is how WNBC on-air news readers had ended their updates. WFAN discontinued the thrice-hourly updates