said by tbk5 I am also working a firewall or router issue. I get the "HDHomeRun Setup detected the PC is not receiving UPnP discovery announcement packets from the network." I can find anything online wrt Win8.
Your already getting the clearQAM stations(which will end soon), and its likely that you need to add an exception in your windows firewall in windows 8 to allow the HDHR to connect to it. I am unsure how to do this in windows 8, but I know it works well in windows 7. Im getting myself an HDHRP soon so that we do not have to pay for a DVR service. Have a nice HTPC set for it already, and its smaller than the charter provided DVR.