Spending much of the 1920s in Europe, Antheil returned to the US in the 1930s, and thereafter spent much of his time composing music for films and, eventually, television. As a result of this work, his style became more tonal. A man of diverse interests and talents, Antheil was constantly reinventing himself. He wrote magazine articles (one accurately predicted the development and outcome of World War II), an autobiography, a mystery novel, newspaper and music columns. In 1941 he co-patented a "Secret Communications System" with actress Hedy Lamarr that used a code (stored on a punched paper tape) to synchronise random frequencies, referred to as frequency hopping, with a receiver and transmitter. This technique, which is now known as spread spectrum, is now widely used in telecommunications.
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