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I was the one that originally flagged the GitHub repo as potentially being sensitive. The primary thing with passive RF use with TV or radio stations is the bandwidth issue. I've been following this particular topic for years and thus was familiar with the ITAR reg dealing with it. itar regs https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M...

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So multistatic here is meaning multiple phase coherent receivers? MLAT is not considered multistatic passive radar?

MLAT is not radar at all for ITAR purposes.

MLAT ground stations just measure the time of arrival of the signal transmitted by the aircraft’s transponder. The difference in time of arrival at multiple ground stations allows the aircraft’s position to be calculated

Very similar to passive radar. That's why I'm asking about what the legal distinction actually is. If I made my two MLAT stations phase coherent, would that make a difference?

No, because it’s just a form of radio direction finding that wouldn’t be covered. Phase coherence has nothing to do with it.

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