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Update README.md

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@ -52,7 +52,7 @@ you wanna update? sure, just run `./compile.sh` if you have a error type in `chm
| Pi3A+|OK|
| Pi4|Partial (system may crash completly)|
| Pi400|Partial (system probably will crash completly)|
| Pi5|Doesn't work (open issue if you have an RPI 5, maybe)|
| Pi5|Doesn't work (doesn't work but I'm trying to fix it, but now I'm too stupid)|
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. (Use [this](https://www.omnicalculator.com/physics/dipole) to calculate the lenght, make sure to use the 1/4 wave setting, as for 1/2 wave you'd need a impedance transformator, and these are not cheap [also yes, i learned it the hard way after having to cut my antenna])