The national analog to digital broadcast "switch" does not mandate HDTV. High Definition (HD) refers to a specific set of video formats, and Digital Television (DTV) refers to signal transmission. Think of a parcel and its delivery truck. Digital signal transmission is a more efficient "delivery truck" than analog, which allows for one bigger parcel (HD content) or several smaller parcels (streams of SD content) than previously would fit in an analog stream. Standard-definition programs are still broadcast over digital transmissions (i.e., your SD-shot footage will still transmit just fine in a standard-definition digital broadcast.)So, because many stations are upgrading, does that mean we can only submit footage that is HD?No, you can upconvert it, or graphically "mask" it in an attempt to disguise the difference in quality/size (best option when budget is tight). But when quality is key, there is simply no way around it — you must reproduce your media for HD.