External antenna for bluetooth and wifi.

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I want to use an external antenna for bluetooth and wifi.
In the photos I noticed the board space for soldering the connector similar to this:

What are the necessary improvements to use external antenna?

I'm wanting to do the same. Looking at the schematic, it doesn't seem like that capacitor connecting the external antenna is loaded either. I assume you also have to de-solder C1910 and solder it onto C1911 (i.e. bypass the chip antenna and balancing circuit).

Did you do this?

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