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Probably this clone of RSP1 from AliExpress for just €20:
Direct image link
Seems more sensitive on HF than direct sampling with RTL-SDR and has up to 10MHz of bandwidth. But due to software support, RTL-SDR still wins. This only works well with SDR++, or if I had Windows, probably SDRUno, since that's official software for SDRPlay devices. But I am too lazy to bother with Windows.
What's it do?
SDR is Software Defined Radio
https://en.m.wikipedia.org/wiki/Software-defined_radio