It's a bit more expensive, and requires buying extra antennas.. But this is a coherent SDR built on 4 realtek chips: https://www.indiegogo.com/projects/kerbero

It's a bit more expensive, and requires buying extra antennas.. But this is a coherent SDR built on 4 realtek chips: https://www.indiegogo.com/projects/kerberossdr-4x-coherent-rtl-sdr#/ https://www.indiegogo.com/projects/kerberossdr-4x-coherent-r...