Millions of $40 government coupons become available Tuesday to help low-tech television owners buy special converter boxes for older TVs that might not work after the switch to digital broadcasting. Beginning Feb. 18, 2009, anyone who does not own a digital set and still gets their programming via over-the-air antennas will no longer receive a picture.

The converter boxes are expected to cost between $50 and $70 and will be available at most major electronics retail stores. Starting Tuesday, the National Telecommunications and Information Administration will begin accepting requests for two $40 coupons per household to be used toward the purchase of the boxes.