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Disregarding the other replies for a moment where they rightfully call out that it wouldn't be radar, wouldn't they still need a publicly available API for this data if they wanted to access it outside of their house (e.g., when at the park)? So at that point, why add the additional complexity if there's already someone sharing ADS-B data to OpenSky for your area?

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I have an Android phone with an OTG cable and SDR Touch and ADSB# - that lets me "see" any plane transmitting ADSB signals around me without any need for a network connection.

(I use that as part of my safety setup when flying drones. If I'm out of cellular connection or my iPad running FlightRadar24 fails, I have a backup self contained plane detection system.)

Why add the complexity? Cause you can. You can also submit the data to contribute while at the same time receiving and displaying it in their webpage.

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