W2XMN

The station ceased operating in 1949, after the Federal Communications Commission (FCC) reassigned the "low band" frequencies (42-50 MHz) to other services.

At this point most of W2XMN's functions were inherited by Armstrong's "high band" FM station, KE2XCC, located at the same Alpine site, which had been established in 1945 as W2XEA, and remained in operation until 1954.

RCA eventually decided that it was not interested in FM, instead concentrating on television development, and asked Armstrong to remove his equipment.

Without RCA's support Armstrong faced a more difficult task in promoting FM, and began to recruit smaller electronics firms as allies.

In addition, Armstrong was independently wealthy due to revenue from sales of his earlier patents, and could afford to spend large sums promoting FM himself.

Armstrong arranged for the construction of a distinctive tower with three large cross-arms, located atop the Alpine, New Jersey Palisades overlooking the Hudson River a few kilometers north of New York City.

)[1] A 1939 article in Fortune magazine dramatically described the station as "When W2XMN, on 42.8 megacycles (approximately seven meters), opened fire in 1938, it was the last gun to crush even the most obdurate opposition.

"[2] In 1948 testimony, Armstrong recapped the events as: Back in the dark ages, when we had static, people said: "There isn't anything you can do about it; that is one of the impossible problems nobody can solve."

[4] In January 1939 he made a widely publicized announcement about his work and future plans, including the introduction of regular FM broadcasts in conjunction with John V. L. Hogan's New York City station, WQXR (now WFME), which had been promoting high-fidelity transmissions on the AM band.

[7] In May 1940, largely as the result of Armstrong's efforts, the FCC authorized an FM band effective January 1, 1941, operating on 40 channels spanning 42–50 MHz.

(An additional temporary frequency assignment for 92.5 MHz was issued in 1947, for "investigating problems of 400 kc separation of FM stations".

[13] Armstrong continued to vigorously fight the pending move to the "high band" on the grounds that it was not technically needed, and also because the higher frequencies had less coverage.

In December the FCC repeated its order that all remaining "low band" FM stations had to shut down by the end of the month.

[1] Afterward W2XEA, operating on the "high band", took over the role of Armstrong's main station for developmental research and regular broadcasting, under a newly assigned call sign of KE2XCC.