If we go back to your TV Fool report,
http://www.tvfool.com/?option=com_wr...0b86cb35bdb459 you'll notice that there is a mix of both UHF and VHF channels listed.
The signal strength is low which indicates the need for a large, high gain antenna which has both UHF and VHF capability. @Dave Loudin's post
http://forum.tvfool.com/showpost.php...4&postcount=51 addresses this in a rather comprehensive manner.
If you are limited to using an ANT-751 and a CM4228, try combining the two using a UVSJ. you'll get fairly good UHF performance and at least some VHF. The CM4228 has little VHF capability. The ANT-751 has some UHF capability but not nearly as much as the CM4228.