Your reception report shows the low power translator for WFMZ on real CH-47, which is confirmed by your conversation with the station engineer. The
path profile link for that entry in your report shows that the station is located 8.2 miles west of you at 280° magnetic and operating at very low power levels, about 200 watts. The good news is that there's no significant terrain obstructing the path.
There are some indoor locations that simply don't support reliable reception. If you've made every reasonable effort to find a workable location and have come up empty handed, I'd encourage you to peruse the next best option(s).
If you can't find a location indoors that provides the signal quality needed for reliable reception using the existing antenna, your left will the option of trying a larger antenna (one that has more gain and directivity, and in this case one that has intentional support for all channels). If you don't have permission to mount an outdoor antenna, you don't have anything to loose by asking for permission.