I rented an old house for a few years that had lath and plaster walls, but they stapled chicken wire to the lath prior to adding the plaster. It made for a decent faraday cage. I had to stand by a window to get cell service. Wifi would not propagate between rooms, so I had to setup a mesh system with individual ethernet connections. I miss it.
I think you are describing expanded metal. This was definitely twisted wires. I had a heck of a time cutting in the boxes for the ethernet. It was built in 1905, and some flipper at some point decided to leave the lath and plaster and just add lath and drywall overtop. Presumably the same person put a metal roof over the old composite shingles and vinyl siding over the wood. They also chose to not add insulation. Always get an inspection before you buy!
