I have a 40" Samsung 1080p HDTV (LN40A550) with ATSC/QAM tuner and two 32" Sony Bravia (1080p via HDMI) KDL 32L4000 TV's with ATSC/QAM tuners.

Before the digital transition using standard cable (straight from the wall...NO CABLE BOX)...in order to view local HD digital channels I would input 52.2 for NBC etc. on all 3 TV's. Since the digital transition the Samsung now uses channel 706 (local NBC HD Station...same as when used with a digital HD box) but the 2 Sony TV's still use 52.2. Since they all have ATSC/QAM tuners why the difference with input since the transition?