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.
Choice of Software Defined Radio (SDR) for radio astronomy - Radio Astronomy and Spectroscopy - Stargazers Lounge
Dongle RTL-SDR.com V3 TCXO + SMA + Bias-T USB key with R860 tuner
RTL-SDR Blog V4 Dongle Initial Release!
RTL-SDR Releases New V4 USB Dongle
RTL SDR v3 & v4- INSTALL & TEST , 2023
RTLSDR4Everyone: Review of the Nooelec SMArt SDR, Direct Sampling and Generic vs Premium Dongles
RTL SDR Blog A Look Inside The RTL-SDR.COM V.4 Dongle
Got a lot of good feedback about my RTL-SDR post so I made a Getting Started guide/tutorial! Take a look and let me know if I missed anything or if you have
NESDR Smart V4 RTL-SDR Essentials Starter Kit - Includes Everything to Start with Software Defined Radio Including Premium SDR Flamingo FM Bandstop