Original vintage broadcasting trade ad for WMCA RADIO 570 of New York City, NY. WMCA Turns People On. Some WMCA Listeners Live so Elegantly They've Ended Up in the Same Boat with President Johnson. Five official IRS mean manned phones to give free tax information an advice which started March 29th. The large cross section of the population that enjoys WMCA music represents the average New Yorker. The Straus Broadcasting Group. Old 1965 broadcasting industry advertisement.