This RTL-SDR Blog V4 dongle (dongle only) offers several enhancements over other RTL-SDR designs, making it an ideal choice for serious radio enthusiasts and developers:
Built-in HF upconverter for direct tuning from 500 kHz to 1.7 GHz
R828D tuner and RTL2832U chipset
1 PPM TCXO (temperature-compensated oscillator) for frequency stability
Improved filtering and tighter component tolerances
Aluminum shielded enclosure with thermal pad for passive cooling
SMA F connector and switchable bias tee circuit
Supports up to 3.2 MHz instantaneous bandwidth (2.4 MHz stable)