lost reception for 2 channels

[oldtownguy]

We get our TV through a rooftop antenna. It's worked great for years and we get 30+ channels via the airwaves. 2 days ago we lost reception for ABC and CBS out of DC. All of the other channels are fine, so I don't think it has anything to do with the antenna. Any idea why those 2 channels dropped? How to fix?

 

[kanewolf]

Could your antenna have rotated in the wind? Is your antenna pointing in the optimum direction? You can use http://antennaweb.org/ to determine the optimum rotation for your antenna. Have you re-scanned for channels? Stations have changed their frequencies before.