Friday is the deadline for the country's move from analog to digital TV. At that point, most analog signals will be shut off. But 2.8 million homes still lack the necessary equipment to receive digital transmissions, says a report released Wednesday by Nielsen.

The number of homes not ready for DTV represents 2.5 percent of the TV market. The report notes that younger, African American, and Hispanic households are disproportionately unready, while the elderly are the most ready.

Geographically, the greatest number of unprepared homes are in the Western U.S., where cable isn't as prevalent as in other parts of the country, says Nielsen. The highest number of ready viewers are in the Eastern U.S.