I tried the foil paper suggestion, I does not work. In fact, it has no technical reason to support this solution.
I still think the metallic/aluminum cover of U310/U410 shield the radio wave reception. The antenna cable travels to the screen hinge(left & right) then seems to be hidden between the screen and the aluminum top cover, as you can see from this video (@1:14):
[video=youtube;9sTKdU59Ftw]https://www.youtube.com/watch?v=9sTKdU59Ftw[/video]
On the other side, this thread explains more details about laptop antenna design vs. reception quality.
http://electronics.stackexchange.co...oes-a-wifi-antenna-work-in-full-metal-laptops
http://www.patentlyapple.com/patent...s-new-kind-of-logo-antenna-for-portables.html
Comparing with macbook air's antenna location, " Since the AirPort/Bluetooth board is mounted inside the all-metal case of this machine, Apple added an antenna that is mounted on the frame for the optical drive opening. Pretty clever!" [@
ifixit]
So after these analysis and investigation, the antenna header should not have been put between the aluminum cover and glass screen, both are quite dense and prevent radio wave transmission.
Would it be better to put at the boundary plastic frame of the keyboard?
Also I don't understand the metalic header plate, which antenna thread welded on, how the shape/form could influence the reception? what shape/form/dimension would be design to get optimal reception?