Looks like my Winegard sensor is failing. Some of my close local channels are not coming in with the tv showing "No Signal". Tried cleaning the coax connections and trying another input to the switch ...
Just on a bet I'd guess you have not cleaned all the coax connectors.
You cleaned the ones at the Atnenna.> At teh switch box/power box (Wall plate or box of many buttons, At the TV, but did you get the one in the roof at the base of the antenna?