Balt, they are some of the Sydney Airport radar site monitors and have been around for some years now. These are the only ones that I can pick up because of their height about sea level.
SSM1 7CF7CA 7712 Centrepoint Tower
SSM2 7CF7CB 7722 Centrepoint Tower
SSM3 7CF7CC 7727 Kurrajong Heights
SSM4 7CF7CD 7717 Razorback
If you have access to PlanePlotter, there are enough MLAT sharers in the Sydney basin to do a fairly good plot on their positions.
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Cheers,
Noel White
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