This is a question for those with some technical knowledge .First I must emphasize that this has nothing whatsoever to do with sunrise or sunset times . This occurs even if sunrise is at 5:00AM and sunset at 8:30 PM or the days are getting shorter like now .WKNY , 1490 Kingston has an unlimited 1KW non- directional signal , with the same constants day and night . They put a decent signal but a bit weak into Poughkeepsie during the day but early in the morning say 7:00 AM I can’t receive them at all . The same goes for the evening . Again sunrise/set times have nothing to do with it . What could cause this ?