I'm helping my mother in law with her freeview woes.
The guts of it is she said that some of the channels don't work anymore - ONE and TV2 at least. Other channels like TV3 and Shine work fine.
Signal on the box is showing 80%. When I checked the channels that aren't working, it seems to be those on Optus D1 Carrier1_s4. My MiL lives in a reasonably tree rich area and I had to prune a tree to get any signal at all. There is some regrowth on said tree now.
I'm a bit of a newb with this sort of thing. I would have thought 80% would give me all the channels no hassle etc.