An off-the-shelf RTL-SDR unit.

RTL SDR case — AppleSauce Engineering

SDR Dongle - Sigfox

The Casefor the RTL-SDR V3/4 dongle

downconverter

ADRF RMK-SDR - 19Rack Mnt Kit-Indiv. SDR Modules

DIY SDR DSP Radio With Raspberry Pi and RTLSDR Dongle - Instructables

Quick Start Guide

Selecting the right software defined radio solution for your

Sub-$100 Networked 433Mhz Receiver for Home Assistant :: apalrd's

Quick Start Guide

Radio On A Tight Budget-RTL-SDR For Everyone, PDF