Got this setup today and when I first scanned for channels it picked them all up instantly and looked good, but after a while certain channels like ITV and Channel 4 got pixcellations on the screen. Other channels can be perfect, so I rescanned all channels and it went back to normal, but it then comes back only on certain channels. Must be because certain channals use different frequencies and is it our aerial is not positioned right? I checked our location for digital TV and everything is good. I also had an aerial man come out around 2months back, unfortunately before I got freeview, this was just for normal TV to improve reception. He said he upgraded/added a larger amp box thingy, so its not sharing so many, as we have aerial feeds in many rooms. Any suggestions?