I went through a similar situation a little over a year ago. I must have went through no less than 10 different anteannas. Channel Masters, silver sensors, Radio Shack, in the attic, on the roof, you name it. Know what finally did it for me? I got an extensio mast and moved my antenna up about six feet higher. I haven't had a single problem since then. I tell you, I was close to throwing in the towel. I would strongly suggest that if there is any way for you to move your antenna up a little higher, give that a shot. And if you are using an external antenna, please make sure that you are grounding it properly. Remember, we get a lot of thunderstorms here.