CHSN availability.

I'm in the Evanston / Wilmette area and have Youtube TV, so presently I cannot get CHSN for Blackhawks games. I plan to try an antenna soon, but had a few questions first. I live on the 4th floor of a 4 story condo and my unit faces north. From what I understand, the fact that I face north is a negative, but being on the 4th floor is a positive. How likely is it that I will be able to get CHSN with this situation?