I'm hoping somebody can shed some light on this.

I had problems with my MythDora setup. Some channels were just not being shown (saying the channel could not be locked). I bought myself a new aerial and tried that. Still the same.

My current freeview box picks up everything just fine using exactly the same aerial, cable etc.

So my questions is, is it my cards that are the problem and they're just not picking up the channels (the ones I have an issue with now are ITV2 and ITV3) or is it something else? Can something be done to the cards / installation to help? Aerial can't be moved (as it's in the loft).