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It's probably not the plaster blocking the signal, but rather a wire mesh which was put up to support the plaster.

Here is where it gets interesting... No mesh, it is lath and plaster. I've had to cut into it in a few rooms and if there is a mesh I have yet to see it. I am wondering what was used in the plaster at this point.

Huh. I know lime plaster can contain significant levels of iron impurities, but I think even in the worst case those would be low enough to have an insignificant effect. Now I'm really curious too.

This is an interesting read:

https://blog.ibwave.com/a-closer-look-at-attenuation-across-...

I am tempted to disolve a bit of the plaster and run a conductivity test on it for fun. It is like living in a leaky faraday cage.

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