Try that^
If the connector is still intact on your PC you don’t need a whole new card. Just a new antenna.
How about a wifi access point in the shop with something like this run outside?
So based on FCC Part 15, does it make external antennas illegal. For example, this product, can I purchase and attach to my access point and still be within the law?
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or
https://www.amazon.com/Computer-Networking-Antennas/b?ie=UTF8&node=3015438011