I’ve just set up an ADS-B receiver, following the list of suggested parts in the FAQ. As soon as I’ve finalized the antenna mounting, I will need to set location and altitude for MLAT. I understand that the antenna, not the rPi is what matters for location; but what part of the antenna?
Should I set location and altitude from the base of the antenna? The center? Top? Is the difference small enough(or expected error, I’m using a GPS module; but probably not a perfect one, large enough) that it doesn’t matter?