On Sat, 24 Feb 2018 08:19:19 +0000, Ben Bell wrote: Antenna cable empty conduit are usually a minor issue, compared with the even triple-glazed window leak. However, the main pitfall is material property + design of the building. As already pointed out, a new building is something like a thinner version of a high-rise bunker, by default quite good, but laminate flooring could ruin the advantage. Old builduings with a wooden ceiling/floor, instead of concrete, are plain resonators.