Silicondust HDHomeRun is networked 8VSB/QAM256 dual tunner device. I streams two video streams via UDP. Supposedly it does not support UPnP. It is already supported with VLC, MythTV and others. Configuration utility is provided in soutce code.
Would be nice to have direct support in mvpmc. So streams from HDHomerum could be watched with MediaMVP without additional boxes (MythTV and etc.)