Need an urgent reply. I am looking to buy a new PCI-E wireless lan card. My current one cannot receive full signal strength (2 of 5 lines) and I cannot even surf into the net. The distance is about 15 meters and the signal must pass through a wall. Is there any valuable solution that would give me full signal strength??
Also, the more the antennas the better the signal?
You really should not have a problem with 15m with any card. Many walls are build to reduce sound which also eats wireless signal very well. It does not take much to block wireless a thin metal film on windows you can see though completely blocks wireless and most cell phones in our office.
All cards transmit exactly the same power, restricted by government, but do have small difference because of antenna.
The problem with PCI-E cards in general is they go into the back of a metal computer case. Then people tend to place them under a table against a wall. Your signal is being blocked in almost all directions. Try with your current pc to move it around the room a bit and see if it makes a difference. They do make models of these PCI-E adapters with longer cables to antenna that you can place out in the open. You are much better off with a cheap USB stick and a USB extension cable in those cases. The USB cable does not reduce the signal levels like a antenna cable does.