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Wifi card replacement question

Level 7
Here is my problem: I have a G75vw that has working WiFi. I can connect to my home router just fine. When I am at work (airport with free wifi) I get low signal strength. It connects, but drops regularly. I was hoping there is another WiFi card that has a stronger signal capture I could swap into my rig. I am fine with pulling the laptop apart and replacing the card myself, I just have no idea what would be the card with the strongest signal capture. I don't care if it has Bluetooth or not.

from the control panel I have:

Atheros ar8151 pci-e gigabit ethernet controller (ndis 6.20)
microsoft virtual WiFi miniport adapter
qualcomm atheros ar9485 802.11b/g/n wifi adapter

Would I be able to have one in the laptop that has a stronger signal capture? If not would it be smarter to pick up a usb WiFi adapter? I would hate to take up a usb slot just to get a better signal.

Thanks for any help.