wireless usb adapter

[TMG1961]

I see how you mean.
It sounds very frustrating, it works 50% , like mono on a stereo, it sounds like it maybe can be caused by the hardware driver, or configuration issues with that driver ?

Have you tried this, solution for speed issues on this card ?

Code:

echo "blacklist acer-wmi" | sudo tee -a /etc/modprobe.d/blacklist-acer-wmi.conf

I have checked noodle cable lengths for you, yes it can be longer this one is same as mine and colour, but mine is 10 metres this one it is 30 metres long , you can get the length you need in this type and around 90 degree corners. Many different sellers it was just first result in Google.
You will get it for much better price by choosing "sort by - lowest price plus postage" in ebay.

Tried the solution in the link you gave but speed is still around 75Mbit. Problem i think is not the card but the 2.4Ghz band, it doesnt seem to go faster. The card doesnt support dual band. My Nexus 6 supports the 5Ghz band and gets to 145Mbit without any problems. So its either a 5Ghz usb adapter or get a cable. Will check out the online price for a flat cable here in The Netherlands.