Thanks to JC for finding an electronic copy of the manual.
Page 75 of the manual: "PRODUCT SPECIFICATIONS"
States: "Television System - NTSC"
Reference to ATSC is missing, therefor it is safe to assume that there is no ATSC tuner in that model. An external ATSC (digital) tuner will be needed. JC's post covers that.
FWIW: Channel Master is offering a DVR with HDMI interface,
CM-7000PAL. SolidSignal.com is advertising the CM7001 for pre-order