So, I set up the KWorld u435-Q on my Win7 PC with their included software and also with Window Media Center.
With the software that comes with the tuner, I am able to receive 16 OTA channels. I can watch them, but have no sound.
With Windows Media Center, it scans and finds the same 16 channels, but when I try to watch any one of them, I get a message that there is no signal.
Both softwares show the same relative signal strength for all the channels. Some channels are strong, full green, some yellow, and some weak and red.
Armed with this info, knowing that the tuner is working (at least to some extent), I will go back tonight/this weekend and re-try to get tvheadend set up to at least scan and find the channels that I should be getting.
If anyone has any pointers or specific direction they'd like to share before I go stumbling around in the Config, I'd appreciate it.