Sonoff 4ch pro r3 wifi / external wifi

Hardware
1

Hello,
I want to add an external antenna for the Sonoff. There seems to be no possibility for an ipex connector. Is it still possible to attach an antenna and where to add?

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2

Ok, I made another picture. What about scratching the antenna blank and get the ground from GND?

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3

Hello,

it is esp powered normally, so this link might answer your question:

How to add an external antenna to an ESP board - ESPHome - Home Assistant Community

4

You need to connect to pad before pcb antenna, not to tail of it. And cut the trace to that pcb antenna.