The GNU Radio folk (who are working on free software to drive DSPs that would let you receive and decode any RF transmission) managed to decode HDTV in software. This is important, because if “analogue hole” style legislation is passed – or even broadcast flag requirements – it will be forbidden to distribute such software. And if those rules aren’t adopted, it means that within a decade, general-purpose computers will be able to display high-res TV as easily and as cheaply as they can make mobile calls or connect to a local WiFi node.
Currently:
user-defined radio tv