A Linux computer, be that a ras/pi or old laptop, or whatever. There is a ton of free software that runs on Linux and not Windows. You could run a VM for free to get Linux running under Windows. And you can use an SDR on Windows or Linux (You don’t have to have the ras pi). This is a good starter SDR, recently purchased the $32 kit with antenna. Works well. There are more advanced SDRs for different uses (SDRPlay, Ham it up front end) that allow more advanced stuff like HF RX but the rtl-sdr is a great starter.
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