Yes I think that is exactly what is happening. As I said I may be the ground electrode for the neighborhood. I am the only one within a quarter mile with an in ground concrete pool and that has to be the best Ufer ground around. The poles depend on a single strand of #6 copper, stapled to the bottom of the pole and most people just have a rod or two. When I was building my pool and deck, everything was bonded and it gets tied back to the service ground via a bunch of copper EGCs. I also accidentally exposed the rebar in my garage footer doing something else and I tied that in too. Every time something becomes "available" it gets used. I now have rods at the satellite dish and also at the HVAC condenser at the far end of the house, tied into the system.
The up side of all of this is in spite of a thunderstorm about 150 days a year, I have not lost a thing.
