AlexYou may have wondered where for this slot on the PCB is. Here is the answer: You can solder a small piece of PCB into it to get a mount for an external antenna:
External Antenna
A project log for ESP8266 (ESP-07/12) Dev Board
PCB for fast development with ESP-07 / ESP-12 with on board USB to Serial converter and on board lipo charge / protection circuit
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