CM4228 does not do VHF
You would be better off if you got one of these because then you could open the bays to widen your reception angle... this antenna also does not do VHF .. it might pickup some stations because your signal levels are really good though
https://www.amazon.com/Xtreme-Signal-HDB8X-NI-Bowtie-Antenna/dp/B00CXQO00K/
its because the longer dipoles are better at receiving VHF tv signals under real channel 14 but in general these antennas will perform better on all frequencies.
the lower the real station number the longer the dipole required to receive it..
the antenna I suggested uses full length antenna dipoles
the other antennas you are using or looking at use 1/2 or 1/4 length dipoles so they cant really capture the full antenna signal wave
That said there are always factors as to how you deploy your antenna as to how well the signal is hitting your antenna .. but think of it this way .. you have a stake to hammer in the ground .. you can use a sledge hammer and hit it 5 times and its in really well.. you can use a carpenters hammer and hit it 50 times and its probably going to wiggle and not be as sturdy.. or you can use a 3yo kids plastic play hammer and just sit there until the end of time and you will never get it
there is nothing wrong with any of the antennas listed on this thread.. if they are used for the proper conditions for the right reason and with understanding of their limitations.
The DB8 is expensive if you wanted only UHF stations it is an ok antenna and I have one myself but I went for the xtreme Signal antenna which is as good and costs half the price or less. The 91XG is also a UHF antenna and it is fine but it is a very directional antenna meaning you need to point it right at the station you want to pick up
if you were going to buy them get the Xtreme Signal ones they test just as good and cost less
https://www.amazon.com/Xtreme-Signal-Range-Antenna-HDB91X/dp/B00CXQO00K
also get the returns from Amazon Warehouse if you can.. they often sell for 25-50% off and are normally in perfect condition..
None of the antennas you have listed are good for VHF reception of 7-10 or any other vhf of 2 through 13
the dipole for UHF starts at about 8 inches and gets somewhat slightly smaller for the higher stations but the single side of a dipole for channel 14 and up is 8 inches at full size.. if i remember correctly .. and for VHF the lower you go 13 down to 2 the longer the full lenght dipole is.. a channel 2 is about 110 to capture one full S shaped antenna signal wave.. or so they say.. they being engineers..
did you run your tv fool report. that would be helpful