Radio: Change Your Numbers

Three years ago at a conference in Havana, radio experts from Canada, Mexico, Cuba and the U. S. sat down to unsnarl the tangled North American air waves. At the time, all kinds of signals were jumping over borders to jam up any programs that got into their path.

Finally agreed upon was an arrangement by which Cuba would get a single clear channel, Mexico five, Canada six, the U. S. 43. Also agreed upon was a frequency shake-up by which more than 1,000 stations would alter their wave lengths. This week these changes go...

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