I would try hanging the pref board off in the other direction with the esp board/antenna sticking out. My NodeMCU signal sucked until I started ... a raspberry pi 2b, and an esp-01s (esp8266 8pins ...

No further details…yet. Beyond the new Wi-Fi and Bluetooth chips, the boards don’t appear much different from the Raspberry Pi 2, I Programmer notes, but the report adds that the FCC documents ...

While a Raspberry Pi is generally pretty cheap, an ESP8266 is even cheaper. And when I say cheaper, I'm talking about picking up one of these microcontrollers for $5 or even less.