She's Up and Running!
OK, I already love this antenna. Install was not too bad - - took down the XG-91 and installed the CM-4251 in its place. Wanted to go higher but to put it above the VHF would have required to put up a different mast. Both VHF and UHF antennas are amplified by a CM-7777.
Anyway took reading from the XG-91 before using a Tivo HD and recorded the Peak signal for each UHF channel. Then after the CM-4251 did the same thing for each channel. In almost all cases the CM-4251 pulled in more signal. See the attached excel - - - also the graph on the second tab.
The weird thing is that for the 4 VHF channels I have the signals were lower for VHF 7, 9, 11 and 13. I'm only concerned about two though 7 and 9. I think maybe the the big Channel Master is conflicting with the VHF antenna. My have to try moving a different VHF antenna over by the chimney.
Here are some pix and the excel.