Welcome to the forum, bodewell:
It is difficult to predict how well an attic antenna will work, because the signal loss from being in the attic is unknown. I suggest that you concentrate on the DC stations first. Many of the Baltimore stations are 2Edge signals that have a terrain path that will interfere with reception. You can view the terrain profile by clicking on a callsign in your report.
An attic antenna needs to have extra gain in comparison to an outdoor antenna which means that it will have a narrow beamwidth that might not cover DC and Baltimore using an aim between the two.
If I was certain that the signals were strong in your attic I would say try an Antennas Direct C2V that has two loops for your UHF signals (real channels 14-51) and a VHF (7-13) dipole kit for 7 and 9.
https://www.antennasdirect.com/store...-Complete.html
horizontal beamwidth
https://www.antennasdirect.com/clear...ntalplane.html
But, if your attic losses are average you will need a UHF/VHF combo antenna, like the Winegard HD7694P or the HD7697P if you can get it into your attic. (Don't hurt yourself on the sharp metal.) If the attic access is small, you might be able to fit an Antennas Direct DB4e for UHF but will need to add a separate antenna for VHF. These antennas must be aimed directly at DC.
My point is that you must be prepared to experiment, including trying different locations in your attic, because I can't guarantee what will work.
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From what I can tell, it looks like the NE corner of my house may be the best location.
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I hope that means no trees or buildings in the way.
Please let us know how you are doing. Use this same thread.