If you have built-in wifi card think is a good idea if you order wireless USB adapters or external wireless pci-e card. There is a limited way to increase the range of a built-in wifi card with common materials, like some of the other homemade diy wifi projects.

Before you buy the wifi card, pcie-wifi card or wireless usb adapter you might want to consider the receiver sensitivity signal. Check the manufacturer’s specification information before you make a decision. The less receiver sensitivity number is better.

For instance
Two wireless usb adapter: Brand-x and Brand-y, they have receiver sensitivity -120dbm and -135dbm respectively. From that specification we can say that Brand-y is much more sensitive than Brand –x because of the lower value.
NOTE: Both values are negative (-).

To increase the receiver sensitivity, I am suggesting you to buy the antenna for specific wifi card like Huawei E220 antenna. That can make your life easier. If you have USB wifi adapter you can try Cantenna, Aluminum Foil Wifi Booster and other Diy Wifi Booster.

Another great way to increase signal reception from your wireless card is to relocate the position of the client or your WiFi Access Point (Wifi AP).