Hi rickyp04,
Thanks for your post and welcome to the forums. It's really great having you on board with us in the Community.
I'm sorry to hear that the quality on the Sky Sports HD channel isn't what you were expecting. Before I can raise this, the first thing I need to do is check your V6 box to ensure that's all good with regards to signal levels.
Looking today, the box is showing as unreachable. Can you please turn the box on, post back here to let us know and then leave on until we reply? This will allow us to check on the boxes power levels and signal levels to ensure they are spot on first.
Thanks,