I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "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."? 

Where was the signal able to reach?