ESP8266 Wemos D1 mini PRO board has an external antenna connector, besides the internal antena. The external antenna is not enabled. To do this, you must move the zero value resistor R16.

Notice the position were it should be the resistor for enabling external antenna connector:

Internal antenna enabled
External antenna enabled

Details before and after soldering

 

 

 

Follow the next article for a test program to read the wifi signal strength RSSI (Received Signal Strength Indicator).


The external antenna is from here

ESP8266 serial WIFI wireless transceiver module MT7681 3DBI gain antenna

 

 

ESP8266 D1 mini PRO extenal antenna
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