Picking up on Andrew's mention of where people are (temporarily) located etc, I recently mapped my three Wi-Fi circuits separately, using NetSpot.
Main 2.4 GHz and only 5 GHz sources - in Router beside main PC
Extender 2.4 GHz source - in added Lounge outside original house walls
See Wi-Fi and Weather
In doing preliminary checks etc to become reasonably conversant with the program, I noted that the relative positioning of the laptop with NetSpot running, to myself was very important.
If I was between the laptop and the Wi-Fi sources, the signal strength could be abysmally low, whilst if I simply turned through 180 Degrees centred on the laptop, the signal strength would rise very significantly.
Similar variations could be seen if the laptop was placed on a table; rotated and observed from a distance, to minimise obstruction.
If anyone is considering mapping their own Wi-Fi, I would recommend making/obtaining a carrier for the laptop, similar to those used to vend refreshments during the intervals in cinemas, theatres etc.
Possibly a baby-carrier could be pressed in to service.
Edited by eckiedoo (Fri 22-Jul-16 18:28:38)