The Hull site also provided ample space for WBZ's shortwave station, which had been founded at Springfield as W1XAZ in November 1929. It later operated from Millis as W1XK, ultimately becoming WBOS. WPIT, the shortwave station operated by KDKA in Pittsburgh, moved its transmitters to Hull at this time, and in 1941 its operations were folded into WBOS. The shortwave transmitters soon began carrying government-provided programming (a service that ultimately evolved into the Voice of America) that would remain the shortwave station's primary function until leaving the air permanently in 1953. The Hull site would also serve as the home for WBZ's first FM sister station, which operated from there as W1XK, W67B, and then WBZ-FM on several frequencies off and on from November 7, 1940, until November 21, 1948.
