I have already got a converter box hooked up to my tv and it does got plainer picture but it still messes up on me and expecally when it rains I can’t even watch tv on it. So why is that I thought that when I got the converter box my picture would be alot better. What is wrong is it my antana or could I just not have it hooked up right I only get 12 channels I had 9 to start with. What do I do?