CBS Radio said Monday that it’s buying Gotham’s 101.9 FM from Merlin Media for $75 million and will relaunch it late this fall as a simulcast for its WFAN sports radio franchise.WFAN will continue to broadcast on-air at 660 AM, online at Wfan.com and via the Radio.com app for mobile devices. “This is an extremely exciting opportunity to expand our radio presence in the nation’s largest market,” said CBS Radio CEO Dan Mason. “Sports is a very popular format and a huge growth category for our business. As a result of this new asset, we look forward to the FAN building on its position as the leading sports radio franchise in the country.” WFAN pioneered the all-sports format when it launched in 1987. Hosts include Mike Francesa, Boomer Esiason, Craig Carton, Joe Benigno, Evan Roberts and Steve Somers. It is the flagship station for the New York Giants, New York Mets, Brooklyn Nets and New Jersey Devils.