the only available tower, the owners of it want a rent paid per foot, dont know the exact amount but know it was expensive.
Is your topography such that there is one high hill in your area that already has a radio tower on top that you might be able to get space on? There are departments that use alpha-numeric paging as their primary dispatch circuit, it's just that they own the equipment/system.
tried that, still have problems at times
If there is no other way than to continue on the commercial service, how about contacting your paging company and see if there is some way that they can prioritize the paging so that your pages jump to the head of the queue.