With the WinTV-quadHD by Hauppauge, you can watch, pause or record up to four ATSC or clear QAM HD TV programs at the same time! The PCI board features four tuners on one half height PCI Express board, and will fit in both full and half height PC's. ATSC is free over-the-air HD TV. ATSC is broadcast in the US and Canada, and does not require a subscription. ATSC is HD and FREE! WinTV-quadHD has four ATSC over-the-air digital TV tuners and supports all ATSC formats, up to the highest HD format.