Thanks for replying Wombatter, I know my dish could be better mounted - and unfortunately I don't think my manhattan has BER, just signal and quality levels.
Funny thing is though, I sure I've heard it on terrestrial channels as well but only on FOX shows, like the "new" simpsons episodes on channel 4.
I thought it might be some "hidden" copy protection FOX were adding to their shows - But maybe its that I'm paranoid and need my ears testing
Regards