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#1

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#2

In my understanding the number of positions reported increases as the length of time the aircraft is visible to the antenna. In others words if the aircraft can be tracked by a system for a longer period of time, thus over a larger area, then that system will report more positions for that aircraft then another system with a smaller coverage area.

So, if the other system has a larger coverage area then you, I would expect more position reports as well as more aircraft.
…Tom