@skywatch 40 Gig in the hobbyist world for domestic spaces where low power is king? Really?
Now that isn't what I said is it? Naughty step for you!
The thing is that many people don't understand RF and have a very simplified view of it.
For the 2.4GHz items many of us use, moving the radio module 5-10cm can make a huge difference in the quality of the signal. These radios obey all the same laws as other radio devices. Changing the attitude of the device from edge facing to flat plane facing can also make a difference as can twisting the device from a horizontal to vertical orientation... With no external antenna (and if there is make sure they are all vertical or horizontal, otherwise signal strength will be reduced).
A lot of the time, simple small movements of the radio device can result in big changes in the quality of signal between two points. This is due to the multipath nature of devices in the home and all the items that can absorb or reflect the signals. Some of these are visible items like radiators, furniture etc, whilst some are hidden like pipework, wiring and metal studs in walls.
Finding the 'sweet spot' may take time, and if you move either end of the link you might have to start all over again!