The measurements scenario with the RTL-SDR dongles, antennas and a PC.

QIRX - Overview

RTL-SDR.com The SWLing Post

A cheap radio and the perfect device to learn software defined radio. Ham radio, ADS-B, police and fire scanning, trunking, satellite imagery - you name it, this little guy can probably do it. Better than many devices at 10 times its cost! Build Details This custom NooElec SDR is a modified DVB-T USB dongle tuned for SDR, including an upgraded crystal, capacitor, and inductor. Devices like those sold by competitors. This lowers the noise floor, improves stability, and increases longevity.

Nooelec NESDR Mini USB RTL-SDR & ADS-B Receiver Set Rtl2832u & R820T Tuner MCX Input Low-Cost Software Defined Radio Compatible with Many SDR

A Look Inside the RTL-SDR Kit (Software Defined Radio with Dipole Antenna Kit)

What are some ways you've improved performance of an RTL-SDR? - Quora

Tutorial on Properly Positioning a Preamp (LNA) in a Radio System

Stealing Keys from PCs using a Radio: Cheap Electromagnetic Attacks on Windowed Exponentiation

Making it rain with Software Defined Radio - Spurious Emissions

Phase Coherent Beamforming SDR