Can I safely assume that your second floor doesn't have tin ceilings? There are restaurants and shops where my cell phone cuts out because of the tin ceiling.
The ceilings are plaster or drywall depending on the room. I'm pretty sure there's no layer of tin in the wee gap that passes for an attic, but I'm not absolutely positive. I'll try holding up a mirror in the closet later in case there's anything visible.
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It's a brick-and-wood rowhouse built in 1867.