Thanks for the report; it's helpful.
In what direction is the Terk aimed? You have channels in many directions, and the best reception is when the antenna is aimed at the transmitter.
You have many strong signals, the best ones from Baltimore at 246 degrees magnetic. The signal attenuation caused by the attic location is difficult to predict, but I think the amp in your Terk is being overloaded, or the tuner is being overloaded, or both. I would not have suggested an amp, just a good antenna in the attic, like the Winegard HD7694P or the Antennas Direct C2V.
Your strongest signal, WMAR has a Noise Margin of 59.4 dB.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
I did an FM FOOL report for your estimated location, and it doesn't look like they would interfere with your TV reception. See Attachment No. 2. If I'm wrong, you could add an FM trap/filter later.