Four years later Lee began experimenting with television using call letters W6XAO. Studios were on the seventh floor of a building at Seventh and Bixel near his Cadillac dealership. A few years later, the transmitter was moved atop what is now called Mount Lee. An early reference to this name is in a June 1939 article in a magazine published by the California Chamber of Commerce: Lee has bought a 20-acre site on a mountain top at the eastern boundary of Griffith Park, widening the transmission field of the Don Lee equipment to take in new thousands of homes in the Hollywood hills and the San Fernando Valley. The site is one and a half times higher than the top floor of the Empire State Building in New York. Mount Lee is thus the highest television location in the world. The transmitter is being rebuilt for installation on the mountain.