Update README.md
PI4 beta
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@ -43,6 +43,7 @@ sudo reboot
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| P2B|OK|
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| Pi3B|OK|
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| Pi3B+|OK|
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| Pi4|In beta mode|
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Plug a wire on GPIO 4, means Pin 7 of the GPIO header ([header P1](http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29)). This acts as the antenna. The optimal length of the wire depends the frequency you want to transmit on, but it works with a few centimeters for local testing.
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