I am looking for similar information as well. Will you please share your data with me once you collect it?
I was involved with negotiating a contract to locate a cellular antennae on our water tower many years ago. From what I can recall, we were able to negotiate $2,500 per month with an annual escalation clause. We requested an additional $30,000 payment to be made at contract signing. We also structured the contract to allow for other carriers to enter into separate contracts with the Town, required the carriers to remove and reinstall their infrastructure at their expense for required maintenance of the water tower, and required the first carrier to build to specifications that allowed for easy installation of other antennas in the future.