For QAM channels, please read the posts earlier in this thread, starting at post 2 and the link there regarding QAM. QAM is for unencrypted cable and the channels you'd get would depend on your exact location, as discussed in this thread. These channels could disappear at any time from a QAM tuner if Cogeco decides to encrypt them.
ATSC is for OTA (over the air) and you'd need an antenna to receive OTA. Please check out the OTA forum here if that interests you and start with the stickies because there's lots of info for OTA, along with reception results for your location.
See also the following post, useful for those new to the forum - FAQs, Search Tips, Optimization, etc: