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Your signals are on the weak side, meaning that an attic mount antenna would probably still be marginal. A rooftop mount would be much better. To get all the red channels reliably, you need a pretty big antenna.
I would recommend a Winegard HD7698P pointed north. It's a big antenna, but size really helps with signal capture.
The reason for the day/night changes in signal is due to atmospheric effects. This effect is known as tropospheric ducting. Variations in air temperature can help radio signals "bend" to follow the curvature of the Earth. These favorable thermal conditions are most common during evening and nighttime hours.
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