Background: Initially, the station's range was officially a 40 kilometres radius of the Alexandra Palace transmitter—in practice, however, transmissions could be picked up a good deal further away, and on one occasion in 1938 were picked up by engineers at RCA in New York, who were experimenting with a British television set.
Question: How far from its studio could the BBC's broadcast originally reach?
Answer:<extra_id_0>.
<extra_id_0> 40 kilometres<extra_id_1>