Connecting SMA-pigtail IPEX to Yùn

Hi everyone!
I’m having problems in connecting an IPEX-SMA adapter to the Arduino Yùn board. I thought that the tiny pin in one corner of the Yùn (see attached picture) was the connector for adding an external antenna for the Wi-Fi. But now some doubts are coming out… is that “hole” just a connector or is it the antenna itself?
If no additional and longer antennas could be connected, what is the approximate range of the Yùn Wi-Fi hardware?

Thank you

fab

ArduinoYunFront_2_450px.jpg

I don't think that's an IPEX.

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