Bug#799669: Atheros wifi card with too low signal

[Néstor <nestorac@gmail.com>]

Package: linux-image-3.2.0-4-686-pae
Version: 3.2.68-1+deb7u3

I have an Atheros wifi card:

Atheros Communications Inc. AR242x / AR542x Wireless Network Adapter
(PCI-Express)

which gets very low level signal, so I have almost no internet
connection, since it does not work with such a poor signal, but the
mobile phone does (Nexus 4). Do you have any ideas on how to correct
this? Maybe there is some parameter for strengh or sensitivity?

I'm on Debian 7 amd64 fully updated on a MSI Wind laptop.

I notice this behaviour since I moved to my new home, some months ago.

Thank you!