Add the repository URL under Supervisor → Add-on store → ⋮ → Manage add-on repositories:
https://github.com/thejeffreystone/hassio_addons
The repository includes two add-ons:
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acurite2mqtt is a beta release that uses uses a SDR to connect Acurite Weather Sensors to Home Assistant
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sdr2mqtt is a beta release that uses SDR to connect any RF device that is supported by the RTL_433 project and push them to Home Assistant