The trouble with high gain vhf antennas is that they also make all the FM radio stations, police, fire, ambulance, aircraft, paging systems, and Weather stations stronger as well.
This can desense or overload the TV tuner causing one signals to get weaker.
The fact that you have to misalign it to get signals tells me this may be what is happening
Even if the 8200's UHF section is working normally, its no match for the perfortmance of an 8 bay bowtie like the DB8E
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