DESC: 40" Diagonal Widescreen MultiMedia Projection Display, Optional set-top receiver required to view DTV programming. Optional external over-the-air antenna may be required for ATSC reception. If your cable company "passes through" a DTV signal unchanged, an optional HDTV set-top receiver can decode and tune the program. However, standards for cable connectivity have not been finalized. Consequently, this product may not be compatible with your cable system.