I can't find a way to do it. Maybe some other way?
For example I do all OTA recordings in the USA
Primary networks like CBS(2.1), NBC(5.1), ABC(7.1), WGN(9.1), WFLD(32.1) All are HD
Secondary or legacy programs are usually SD
2.2,2.3,2.4
5.2,5.3,5.4
7.2,7.3,7.4
9.2,9.3,9.4
etc...
Would like to make HD channels a higher priority