Let's not forget the 9999 Iris location. On the nortwest side, Plymouth Road and Meyers area. A new tower (a very nice structure) was erected next to the original tower about 4-5 years ago with all of the hardware mounted for the new system. It was very active during the introduction/testing phase of the system.
This location has been used by the city for over 50 years and the original tower was at least that old. Approximate Lat/ Long 42.3695 -83.17005
This location does not seem to appear in the tower list but I would think it has to be active in the current system. If, not it's a monument to how to spend a bunch of money in the development of a radio system. Possibly the tower, or more likely, any copper wire, could have been systematically dismantled and moved via shopping carts to the local scrapyard, resulting in a propagation hole.