"It was discovered that [Edwin] Armstrong had been paying out some $1,500 per month for years in high-fidelity wire charges between Washington and New York to keep some 'live' FM programs, such as the Library of Congress' chamber music series, coming into the New York area over WNYC and his own Alpine station via the foundering FM Continental Network, which had to cease operations at his death…FM stations were rising on all sides. In quick order, WQXR in New York, WHAM in Rochester, WTMJ in Milwaukee, WMCR in Washington and WBNS in Columbus added FM to their broadcasting services. Armstrong gave WQXR— 'The Good Music Station' founded and operated by his old friend John V. L. Hogan—its first FM transmitter to make it the first commercial FM station in New York…"

Source: Lessing, Lawrence. Man of High Fidelity: Edwin Howard Armstrong. Philadelphia, Pa., and New York: J.B. Lipincott, 1956. pgs. 247, 301 and 302.