I have never had a perfect signal from NBC (36.1) in Charlotte, but this weekend it completely disappeared without me having changed a thing. I have a strong signal from Fox and CBS, which are located within 1 mile of NBC. This is what I have tried without success: Rescanned for channels on the TiVo. Switched from the TiVo tuner to a TV tuner and scanned for channels. Scanned using other TVs in the house. Checked the signal amplifier to make sure it is working. Realligned the antenna, although it appeared good. At this point I'm at a loss. I have the following dual quad bay antenna: https://www.amazon.com/gp/product/B00DHHMOUW/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 Can anyone help?