Cooper says in April 2003 the company will bid on some radio frequency spectrum about to become available from the Federal Communications Commission.

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The most important is worldwide radio-frequency spectrum, obtained by Iridium through international negotiations.

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The technology uses gaps in radio spectrum, called 'white spaces', which exist in between frequency bands.

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The cheapest way to increase capacity is to add more spectrum or to move a network to a lower frequency, which allows radio waves to penetrate walls more easily.

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