The 5 GHz WiFi is more critical of PRECISE location, orientation etc, due to its shorter Wavelength; also such aspects as if you first test with your portable device unobstructed by your body, compared with turning "about face", so that your body obstructs the signal path.
Whilst ACRYLIC and inSSIDer will show what WiFi circuits are operational around your location - such as the neighbour's etc, NetSpot will allow you to carry out a survey in and around your house - with the above aspects still to be taken into account.
I have done such surveys on three houses - results can be interesting.
Also I found that my 5 GHz WiFi was generally 10 dB down/worse than my 2.4 GHz, thus because of that difference, the 5 GHz is frequently actually slower in terms of Data Rate etc, than the 2.4 GHz.
If you do try NetSpot and its survey facilities, do each floor separately, subject to your house having two or more storeys.
On the other hand, include the garden etc with the most appropriate storey, normally the ground floor.
At each survey point. you have to decide on precisely what aspect you are concerned with.
For example, if you normally use your portable device sitting in a particular chair and it on your knees, then that is how that survey spot should be recorded - even if standing up with the device gives a stronger signal - as in "Porridge" when Fletcher had the TV set on his head!
It is as critical as that.
Also the 5 GHz WiFi is more subject to variation due to such aspects as someone else or pets in another room happens to walk in to the path, without your being aware of it.
You may have noted fluctuation in TV signals particularly when vehicles go past, particularly large ones. Similar situation with WiFi - both bands.
Also slight position/orientation change of a Mobile/Cell can have quite an effect.
The 5 GHz Wavelength is about 60 mm (6cms or just about 2.5 inches), so differences in location in 3 dimensions, of that order, does affect it.
Correspondingly, 2.4 GHz is about 125 mm, so less critical.
It is the Natural Physics of Radio Waves.
I find thinking of the Modem WiFi source as being a single small LED, trying to light all of my house, with the walls, bodies etc having different degrees of transparency, is a good way of visualising the likely variations.
Similarly for your iPad "talking back".
Ethernet on a cable connection is a "solid connection" in comparison.
You may find that for reliable iPad WiFi connections, you have to use some form of repeater - and its location is similarly critical.
Edited by eckiedoo (Thu 24-Aug-17 14:33:34)