120inna55,
korsjs,
some stations turn up the signal at night.
120inna55,
Many station have no digital feeds active until primetime, (not sure about your networks)
Most will run sub channels so there is a picture on the channels, but not all.
Most of the time ,where I live, there is no HD until evening.
Also, a lot of channels are running on low power still, until the FCC requires full power, that was a definite issue with my networks about a year ago, now I think my networks are up to full power,as they are easier to pick up.
Jimbo