Sorry you are having trouble.
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I'm having is drop outs on channel 12.1(KSAT)......my signal stays 48-50%.....SNR(db) is 271 from my TV
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That SNR must be 27.1 dB.
Do you receive the other VHF channels? What are their signal strength and SNR readings on your TBS tuner?
KLRN PBS real channel 9, virtual channel 8.1
KCWX is listed as 8, but that is wrong; it's on ch 5
KQVE-LD Daystar real channel 13, virtual channel 46.1
What readings do you get on the UHF channels?
You did the right thing moving the antenna to different locations because there are a lot of multipath reflections indoors.
You have some strong local FM transmitters that might affect VHF reception.
http://www.fmfool.com/modeling/tmp/7...0/Radar-FM.png
It might be worth the trouble to try an FM filter in the coax.
https://www.antennasdirect.com/store...on_filter.html
A HLSJ can also be used as an FM trap, because it blocks everything below CH 7 including the FM band using the high and common ports.
http://www.solidsignal.com/pview.asp?p=zhlsj
I'm not certain if your tuner is being overloaded. The signals inside might be stronger than I think. You might try inserting a splitter in the coax as an attenuator an see how the reception and readings change. A 2-way splitter gives 3.5 dB attenuation; a 4-way, 7 dB.
The C2V VHF dipole has less gain than the UHF loops. It is also bi-directional which means it might pick up multipath reflections from the rear.
You can cover a piece of cardboard with aluminum foil and use it as a reflector about 14 inches behind the VHF dipole to make it more directional and have a little more gain. If that doesn't work for 12.1, the only other thing I can think of is to use a separate VHF antenna combined with the C2, instead of the dipole, that is more directional and has more gain.
Do you have a TV that you can try with the antenna instead of the TBS tuner card?