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InfluxDB
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It's also worth noting that there are cheaper alternatives with similar output capabilities. This page details the hardware, but as I've found, you generally also will want an external amplifier and low pass filter for the best results. I can capture RF output right now, but it's somewhat staticky, so I'm waiting for some parts to arrive from China.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.