Your idea of mesh inside the stucco is way better than my idea of simply wrapping chicken wire all over the outside. Ha. It should work, as long as it all has

Your idea of mesh inside the stucco is way better than my idea of simply wrapping chicken wire all over the outside. Ha. It should work, as long as it all has electrical continuity and is grounded. I think that's where a lot of normal mesh in stucco or plaster falls short; nobody is going to bother to connect it all up with copper strips or whatever if that's not their explicit goal. Even if it's not, it should attenuate radio waves somewhat. Just not as a full-coverage Faraday cage.