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I am doing a project, which requires my using multiple antenna to obtain the CSI using Raspberry Pi, but I only got one CSI stream all the time, I just wondering how many built in antenna does Raspberry Pi 4B has for the WIFI module?

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  • using multiple antenna to obtain the CSI... What exactly do you mean by this? Can you give more details on what exactly you want / need to achieve? Please update your question with this information.
    – Dirk
    Commented Dec 14, 2020 at 11:00
  • I mean using multiple antenna to form a MIMO system with my router, to capture Wi-Fi signal and extract channel statement information by using Nexmon CSI tool Commented Dec 14, 2020 at 13:50

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There's just one antenna, and AFAIK it is shared between WiFi and Bluetooth.

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