New homes (at least where I live) all have TechShield (or similar) radiant barrier installed for energy efficiency. It's basically siding or insulation covered

New homes (at least where I live) all have TechShield (or similar) radiant barrier installed for energy efficiency. It's basically siding or insulation covered with a thin layer of foil. It's effective enough as a Faraday cage that some of my friends with new homes can't get a cell signal in their home. I wonder if this will be enough to thwart the casual eavesdropper.