Generally asking about connect RC module

should hook to a RX pin on Arduino or connect to any pin, which one better?

Not even close to being enough information for us to help you.

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Usually one does not connect anything to the RX pin (if the RX pin is the USB serial port). The RX and TX pins are used to upload code. Connecting a second device to the main hardware serial port can cause problems with code upload.

That said, what exact RC radio module are you talking about? What Arduino board?

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