I bought a USB stick instead of an RTL-SDR dongle. I thought the built in filter would perform better but it doesn't. Using it with a Pi Zero W with PiAware has reduced the number of observed flights significantly (from 1800 per day to around 200). Maybe I have a bad block or something as it heats up too. The RTL-SDR also gets hot, but at least it has a metal case that acts as a heat sink. You can see in the attached image when I've used the AirNav FlightStick versus the RTL-SDR dongle and it feels like day and night.
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