I and @rafael.lehmkuhl added an external antenna, it’s necessary to cut the connection between the external connection and the 0 ohm resistor.
Result:
- In-circuit antenna.
- 10 cm : -30dBm
- 5 m : -62dBm
- External antenna.
- 10 cm : -31dBm
- 5 m : -52dBm
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