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DIY SDR HF Up-Converter by WA7JHZ: Another good choice for your RTLSDR.

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NooElec Ham It Up Plus v2 - Extend the Range of Your RTL-SDR, NESDR or Other Radio Down to 300Hz. HF/MF/LF/VLF/ULF Upconverter and Panadapter w/TCXO & Switchable LNA/Passthrough Options : : Electronics

DIY SDR HF Up-Converter by WA7JHZ: Another good choice for your RTLSDR.

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upconverter – rtl-sdr.com