Having a detached garage my unit keeps connecting and unconnecting I think that I am right on the edge of my wifi signal. Is there anyway of extending or strengthening the signal?
ESP8266 has a particular version (ESP-07) which supports external antenna. If you need you can make a custom order so that we can solder the ESP-07 module onto the board, which has a connector for external antenna.
Another solution is to add a WiFi range extender somewhere between your router and the device.