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The Winegard antennas , HD8200U and HD7698P and HD869(X) P , antennas have phasing lines (wires) that go into the plastic box on the antenna that connects for the coax connection. Check the connections to see if the wires are still connected and connected correctly.
Also check to make sure the phasing lines are not touching the boom.
The cartridge board might be bad.
www.winegard.com/kbase/show_vid.php?vid_num=1
www.winegarddirect.com
Connect a New continues length of coax to the antenna and run the new continues length of coax to 1 Tv.
What is reception like now??
Then add in the , preamp , power injector , power supply .
What is reception like now??
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If a new amplifier is installed then install a , Winegard , LNA-200 'Boost' XT amplifier .
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www.solidsignal.com
www.amazon.com
www.winegarddirect.com