"I tested the wireless card by booting Trisquel from USB and reconnecting to my home network ... However, after rebooting the laptop, the antenna is no longer even detected by the system."

You probably need the open-ath9k-htc-firmware package. Please install it on your computer. It should be available from within your package manager:
http://packages.trisquel.info/search?keywords=ath9k&searchon=names&suite=belenos&section=all

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