RTL-SDR Blog sticks have been around for a while. They can receive HF signals up to 1000 MHz or higher. The RTL-SDR Blog V4 is the fourth generation.
RasPad 3.0 Review: Building a Portable Raspberry Pi 4 Tablet with Built in RTL-SDR
RTL-SDR Blog V4, Better Than V3? (review)
Includes 1x RTL-SDR Blog V4 R828D RTL2832U 1PPM TCXO HF Bias Tee SMA Dongle and 1x Multipurpose Dipole Antenna Kit Several improvements over other
V4 R828D RTL2832U 1PPM TCXO HF Bias Tee SMA Software Defined Radio with Dipole Antenna Kit
Block diagram of the RTL-SDR.
Software Defined Radio (SDR/RTLSDR) - General Radio and Digital - Media Spy
Nooelec - Nooelec NESDR SMArt v5 Bundle - HF/VHF/UHF (100kHz-1.75GHz) RTL- SDR Kit with 3 Antennas. RTL2832U & R820T2-Based Software Defined Radio
Dongle RTL-SDR.com V3 TCXO + SMA + Bias-T USB key with R860 tuner
SDR driver - Apps on Google Play
Nooelec - Nooelec NESDR SMArt v5 SDR - HF/VHF/UHF (100kHz-1.75GHz) RTL-SDR. RTL2832U & R820T2-Based Software Defined Radio - SDR Receivers - Software Defined Radio
RTL-SDR Blog V4, Better Than V3? (review)
RTL-SDR Blog V4, Better Than V3? (Review) – Elektor