I know that the Portage Co FDs were approached to join in this venture and at this point seem to be committed to stay with the VHF systems. PCSO had indicated that they were moving to MARCS regardless.
In this proposal it was mentioned that the MARCS folks were prepared to add additional towers to improve coverage. Currently there is only the Shallersville tower in Portage Co but there are towers in all of the adjacent counties. When looking at the MARCS build-out presentation, there is no indication that there will be any new towers in Portage through 2016.
I can't imagine that this one tower will provide sufficient coverage where the other counties with similar geographic topography that have committed to MARCS have added multiple sites. I'm thinking there must be more in the works then I am aware of.