Thank you all for the replies!
As I mention in this old post I have a Digiwave ANT5013, it is one of those fancy plastic box digital antennas that claim amazing performance. And in the summer it did, indeed, perform amazingly!
Its not small, but nowhere near as large as an 8-bay “traditional” antenna.
When I first noticed the channel 2 problems I thought it might be the antenna or amplifier inside of it failing in the cold. But then I realized only a few channels were affected.
Thanks in advance!