I'm using gsky wireless usb adapter model: Gsky-link GS-27USB.
When I connected it to a 15 meters usb extention cable it's recognized by the computer but it doesn't find any network. Without the usb extention cable it finds many with good signal.
The cable I have seem to have a repeater (on one end it's pretty thick like the repeaters I see on these cables: https://www.google.co.il/search?q=usb+repeater&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjt-L7a2MjQAhWhA8AKHWHaBd4Q_AUICCgB&biw=1239&bih=627 )
Just as a test - I replaced the original usb cable that connects the device to the computer with a simple cable and it also works.
Edit (added): The extention cable works when connected to a regular, simple disk-on-key.
Any suggestions?