Fenvi FV-T919: Anyone know which of the 4 antennas is bluetooth?

https://www.aliexpress.com/store/product/Fenvi-FV-T919-802-11AC-Desktop-Wifi-Card-802-11-A-B-G-N-AC-BCM94360CD/106046_32778371977.html

Was thinking of buying a longer antenna for it since the Bt signal is pretty weak (to the magic mouse). Is this even a good idea? thanks!