The next step to try is , The tv channels of the of tvfool radar map green reception zone are Very Strong . PBS is Very Strong at your location. And so are reflected tv signals that are received from the surrounding area. With the antenna inside the house the signals are reduced. I recommend a , 1296F variable attenuator form ,
http://www.solidsignal.com , to Dial Down the signal strength of the received main signals and reflected signals. That way the tuner can more easly filter out the out of phase reflected signals. Also you can contact the engineering department of WBIQ UHF channel 39 PBS. Many times the engineering departments of of tv stations will be able to help with local receptions. The engineering department are interested in the reception of the signal and many times will bring test equipment to the house to have a look at whats up with the reception and help you resolve the situation.