6121 Sunset: Nestor Studio / Christie Studio/ CBS Radio Square

Until the latter half of the 1930s, commercial radio was primarily based in New York and Chicago because the technology that made radio programming possible was oriented for east-to-west transmission making it prohibitively more expensive to broadcast a show in the opposite direction. The regulations changed in 1935, sending radio rushing to Hollywood just as moving pictures had done in the 1910s.

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