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.
RTL-SDR Blog V4, Better Than V3? (review)
RTL-SDR Blog V3 R860 RTL2832U 1PPM TCXO HF Bias Tee SMA Software Defined Radio with Dipole Antenna Kit (Silver) : Electronics
NEW IMPROVED , RTL SDR - V4 RELEASED
What are some ways you've improved performance of an RTL-SDR? - Quora
RTL‑SDR R820T2 V3 RTL2832U Software Defined Radio Smart HF Bundle Antenna with RTL2832U ADC Chip for Computer Based Radio Scanner 480 kHz to 1.87 GHz : Electronics
RTL-SDR Blog
RTL-SDR BLOG V3
RTL-SDR V3 Review: RF-Vision Superpowers! - OnElectronTech
Radio For Everyone new Posts: RTL-SDR Accessories, 5 Easy Mods, FAQ, Legal/Moral Issues and Portable SDR
Dongle RTL-SDR.com V3 TCXO + SMA + Bias-T USB key with R860 tuner
What are some ways you've improved performance of an RTL-SDR? - Quora
RTL-SDR Releases New V4 USB Dongle
RTL SDR Blog A Look Inside The RTL-SDR.COM V.4 Dongle