• Aerial - whip antenna - works nice... it is 1/4 wave length (31mm). The -45 degrees ground plane though is missing, so I do not know the impedance... (The original, intended use of the ESP-09 was within an H0 model train engine of metal - an ideal ground plane.) - On the breadboard as pictured, the big fat electrolyte capacitor may help with the radiation with its aluminum case. My wifi access point is actually pretty far away: I sit at one end of the house on second floor and the access point is at the other end of the house on first floor.


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