I just purchased an indoor antenna the Zenth ZHD-TVI and get FOX-HD, NBC-HD, ABC-HD, all at 50% about half the time. I am located in the Cincy area. If I purchased an outdoor antenna will I get 100% most of the time? I am new to this satelite thing. Dish installer told me I didn't need a HD antenna. I kinda wish I would of stayed with cable after all this.