I need to jump on this thread as a former WMCA employee, and, radio archivist/jock/fan. WMCA was number one in Midday all the way up to 1969, when WABC cleared out Don Mc Neil's Breakfast Club, the news block at 6PM, and went head to head with music every hour with WMCA. Late in 1968, WABC retired HOA in the morning, and took WMCA's best rated jock, Harry Harrison, and moved him into morning drive further debilitating WMCA.
At the same time, R. Peter Strauss was returning from The Johnson Administration in Washington, and inspite of the existence of WBAI, believed that New York needed a liberal talk radio station. Yes WABC was bigger slicker and pro-active, but WMCA was indigineous radio for New Yorkers, for which there has been no replacement.