I have the equipment as seen in the signature below, and I have a problem with WGRZ in the winter. It's hit and miss--certainly not reliable enough to plan viewing.
With any luck, there could be a "tropo" event on Super Bowl day. It's happened in the past. The year before last, I had great reception of the entire game on CBS (WIVB) Buffalo.
Either way, I'd say your chances are receiving WGRZ in February, in K/W, with a rooftop installation, are poor at best.
DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR