Will the CM4228 not be efficient enough when I do get the height? Is it heavier than 91XG?I remember seeing those. They were good antennas. The CM4251 is considered the most powerful UHF antenna ever made and the CM4250 wasn't far behind. (They had the same design but a different size dish.) The biggest issue with these antennas is wind resistance. A neighbour's CM4250 brought their antenna tower down in a wind storm not too long after it was put up. Be prepared to possibly beef up the tower or install guy wires.
From the TV Fool report, it looks like the issue at this location is height. Even the closest stations are 1 edge and most are two edge or Tropo. I would be tempted to get a taller tower and a lighter antenna such as the Antennas Direct 91XG. I would try plugging different heights into TV Fool to see where some of the weaker stations get to be LOS or 1 edge with stronger power levels.