I have had an OTA antenna hooked up to my HR20-100 for a few weeks now. I was getting between 60 to 70 percent on the signal meter from my local CBS affiliate. As of Sunday morning I cannot pick up the signal at all. The antenna has not moved and the other locals come in at the same level as before. Nothing has changed physically with the antenna or the surrounding area around my house. Any ideas what went wrong? Could it be with the signal coming from the TV station?