3.1 Commercial SDR Kits 
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    10 SDR's in 2020: 
   https://blog.bliley.com/10-popular-software-defined-radios-sdr  
   1. HackRF : 1MHz - 6GHz, half-duplex, 20Msps, GNU Radio, SDR#
   2. Ubertooth One SDR : 2.4GHz, open source
   3. YARD Stick One USB Transceiver: 300-348, 391-464, 782-928MHz, half-duplex, 
   0.5Mbps
   4. Kiwi SDR : 10kHz-30MHz
   5. NESDR Mini 2+ 
   6. NESDR Nano 2+
   7. RTL-SDR: 0.5MHz-1.7GHz, receive only
   8. Ham It Up
   9. NESDR Nano 3 OTG: 25-1700MHz
   10. NESDR SMArt HF Bundle
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    Other kits: 
   - TZT : 70MHz-6GHz SDR platform
   - Elektor SDRShield
   - Ancrotek SDR-KIT 770T2R4
   - SiDRadio 
   - LimeSDR Mini
   - PicoZed SDR
   - STEMlab 125-14 SDR 
   - CML Microcircuis DE9941A
   - PlanetComm SOLO8 SDR
    Comprehensive list on Wiki: 
   https://en.wikipedia.org/wiki/List_of_software-defined_radios 
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   3.2 SDR Software 
    HackRF support software:
   - GNU Radio
   - GQRX
   - SDR#
   - SDR_Radio.com V2
   - Universal Radio Hacker
   - QSpectrumAnalyzer
   - SDRUno
   - HDSDR
   - SDR Console
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