The Channel 4 signal in our area is pretty weak, with poor sound and picture reception. However, if I select the VCR channel on the TV, take the VCR off standby and run C4 through that, the picture and sound are much better. Why - surely it's the same strength signal?
I'm not too well up on the technical terms, but if "digibox" means Freeview then we can't get that either. It's something to do with not interfering with French TV (as if they'd be bothered about ours!).