3 or 5,8 db LoRa antenna

Hello,
We tested you RAK7243 with Fiber Glass LoRa Antenna 3 dBi, it works well.
Then we tested with 5.8dBi / N-Type to iPEX / EU868MHz.
The signal is now weaker.
Should the configuration in Loraserver be modified?
What parameters need to be changed to get a better signal
Thank you for your answer

Hi. Are you using the same cable for both antennas?
How do you measure this? Some logs from packets?

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