accessing parameter (with non-basic type) of C++ signal

Have you registered the C++ QGeoSatelliteInfo as a known type to QML? If you have and QList<QGeoSatelliteInfo> doesn’t work you could try making it a QVariantList on the C++ side. The data conversion docs [qt-project.org] make me think this would work, whereas they aren’t specific about QList<T> except for basic types for T.