Szymon Jakubiak on Twitter: "ESP8266 is known from freezing when WiFi signal is weak. Simple dipole antenna allowed to increase signal strength from -69 dBm to -63 dBm. Nice! https://t.co/TaJU2M0PeP" / Twitter
Build your own Wi-Fi Repeater or Range extender using NodeMCU to connect all your IoT Devices
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How to Use a Directional Antenna with ESP8266-Based Microcontroller « Null Byte :: WonderHowTo