However, if that is all you can get, then go for it. I have seen guys mount a Rohn 25 type tower on the platform where the railing is, mount the antenna on top of the tower section(s) and then the top of the antenna will see over the top of the water tower.
Problem is, there's a fire repeater on the top, and they want us on the side, specificially NOT above the side. I'm just looking for a way to predict the pattern(s) so I can plug that into RM, and see if it's worth spending a bucket of money to change to this site.