An off-the-shelf RTL-SDR dongle.

RTL-SDR Blog silver dongle first impressions, compared to NooElec blue dongle, by R. X. Seger

A New Project: Plane/Sailing Portable

Top DNG Builds a $600 Digital Radio Scanner on the Cheap — with a Raspberry Pi 5 and RTL-SDR

New Product: RTL-SDR Blog 1090 MHz ADS-B LNA

Using the Raspberry Pi as an RTL-SDR dongle Serve - The

A Low Cost 2.4 GHz Downconverter from off the Shelf Dev Boards

PDF] A Comparative Study of RTL-SDR Dongles from the Perspective of the Final Consumer

I might get a lot of grief for this post, but it is what it is (SDS 100 -vs- cheapo RTL-SDR)

Sub-$100 Networked 433Mhz Receiver for Home Assistant