Springfield is on the list to be upgraded to ATSC 3.0, so you might want to look into getting a DVR/Tuner that would work with it instead.
https://www.silicondust.com/product/...un-connect-4k/
This is the best priced ATSC 3.0 tuner I can find. Not sure how you would go about using attached storage as a DVR, but there seems to be options.