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  1. Would it be possible to detect when somebody closes/opens/uses their keyfob (based on radio frequency) ? It is of course not the intention to hack the key. Just knowing when somebody has pushed a button on it.

    1. If so what could be the possible range and what hardware/software should be needed (what antenna?, Arduino, Raspberry pi, extra software or drivers etc...)

Thank you so much for your help.

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That should be possible. Your best option is SDR (Software Defined Radio). It uses a standard PC or even a Raspberry Pi in combination with a DVB-T tv receiver as the radio.

A great starting point would be GNU Radio and its hardware section

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