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Old news.
The truth is , All antennas are design compromise.
Improving the UHF performance of the CM4228HD reduces the VHF performance.
Any antennas performance can be improved or reduced by making changes to the antenna , it is a trade off improve one aspect and reduce an other aspect.
Channel Master designed the New CM4228 to be a balanced antenna for reception of UHF channels 14 thru 51 and VHF channels 7 thru 13.
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Here is Real world testing.
http://www.antennahacks.com/AntennaComparison.htm.
http://www.antennahacks.com.