North America will see the greatest mobile TV growth, with 28.8 million subscribers by 2011, more than 20 times the current number.

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Mobile TV will have 140 million subscribers by 2011, according to Screen Digest’s "Mobile TV: Business Models and Opportunities."

Yet free services will account for most mobile TV viewing, making paid subscriptions a tough sell.

"The free-to-air services are the success stories for subscriber uptake, yet business models for mobile pay-TV are still to be proven," said Ronan de Renesse, author of the report, in a statement.

Asia has more than 15 million mobile TV subscribers. The majority of broadcast networks there are offered free-to-air.

As a result, the research company predicted that the Asian market would generate less revenue than Europe and the US by 2011.

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