You are welcome. When/if you decide to put up a tower, do your homework. Make sure you have all your bases covered and take your time. It will save you a lot of heartache and possibly money in the long run. Solicit opinions from those who have put up big towers. Plan, plan, plan. When you are finished, plan some more.
I think you may have been given some bad advice by the folks at Collierville. What they meant to say is the city itself might not have any specific requirements regarding towers/antennas, like Germantown, but they neglected to tell you that anything you erect is going to fall under the jurisdiction of Shelby County Zoning.
That is a fact. The folks over there are very helpful. Stop by sometime and see them. They are out at Shelby Farms. Get a copy of the ordinances and tell them where you live. It never hurts to get a second opinion. If Collierville gives you bad info and you get caught up later, they won't take responsibility for it. I can assure you that it is imperative to have that final permit in hand when one of your neighbors shows up *****ing about TVI or the general esthetic issue of your structure.
Good luck.