Digital channels will not tune

Question

I have a magnavox 32 inch. I have had it about a year. I had it in my basement and it found all digital channels with no problem. I moved it upstairs last night and had it reprogram the channels and it found most of them but there are still 4 or 5 digital channels I had downstairs that it won't find. Any ideas? Same setup upstairs except I have it sitting in an airmore. Would that make a difference?