Analog broadcast TV signals will stop in February 1999

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http://www.ncta.com/ContentView.aspx?contentId=4355

Or, there's a do-it-yourself method available: You can buy a special add-on "converter" that will let your old TV sets pick up and display over-the-air digital signals. These converters will be available from retailers early in 2008, and the federal government wants to help you pay for them. You can apply for up to two vouchers that offer a significant discount off the price of the converters. For more information on the converter coupon program, go to www.DTV.gov, or call, toll-free, 1-888-DTV-2009.