I'm a bit stumped. I have a roof-top UHF antenna, professionally installed, with line-of-sight to the DVB-T Mount Kau Kau attenna in Wellington.

I'm having real trouble with the Kordia stations, like Prime, but the TVNZ and MediaWorks are rock solid.

When I watch Kordia live, it stutters very badly, and most of the time the screen / audio is full of garbage.

As I said, TVNZ and MediaWorks are solid

MediaPortal signal meter even tells me as much, with 85%-100%, except on Kordia where it's 50%.

I have a Windows 10 PC, with the latest drivers for my TBS 6205 quad tuner.

Any suggestion how I can improve Kordia channels?
NextPVR software has the same problem