I have older relatives who still rely on over-the-air analog signals. They live in areas far from any broadcast towers but currently receive all major stations, except that their nearest NBC affiliates are never very clear. They use a rooftop antenna, which is stationary. According to sites we found online, (e.g. tvfool.com, etc.) these available NBC affiliates are not listed very high on the available digital station list for their location. Does this mean that they will likely no longer receive those NBC stations or that, at best, they might receive an intermittant signal? Or should they receive a viable signal, since the current analog signal is strong enough to yield a watchable picture?