It’s very difficult to generalise ‘path loss’ of a radio signal, i.e. how much a signal degrades to the point where connections fail, in any situation. So many things can affect the signal loss within the domestic property, wall thickness and brick structure, how the bricks are made, wall shelving, etc. You can download various WiFi signal measuring apps for both Apple and Android phones which you can then use to estimate how strong the signal is at any point. In my house the 5Ghz signal becomes unusable in a room 25 feet through two substantial brick walls and one stud partition wall, level is lower than -80dB. The 2.4 Ghz signal is fine, about -67dB. Even then the usability of the signal will depend on the ‘sensitivity’ of the WiFi receivers used by the products to want to connect to the WiFi signal. In general, the more expensive an item the more chance it will stay connected to a weak signal, but even that statement may not hold true for all WiFi devices. My Living room disc connects reliably with a signal level of -73dB and that is 20 feet through two internal walls, (one breeze block), and the upstairs floor. If I were to guess then I would say a signal level of lower than -80dB would be unusable. For either 5Ghz or 2.4 Ghz but the lower frequencies do go farther.
The above may be a bit to technical for some and I’m sorry if it is, but hopefully it shows that every house will be different but the very best place to have the hub is upstairs and in the centre of the house, if at all possible.
