A new method of delivering broadband internet access to millions of Americans has the potential to expand greatly the number of students with broadband service at home--and it could provide a cheaper way for schools in remote areas to get online. But the method faces steep regulatory hurdles before it can become available.

Microsoft Corp., Google Inc., and other technology companies are bumping into resistance from U.S. television broadcasters as they seek regulatory approval to deliver high-speed internet service over unused television airwaves.

The technology companies, which have submitted a prototype device to the Federal Communications Commission for


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