I sure know nothing about your county, and their website doesn't reveal much:http://www.goprincegeorgescounty.com/Government/BoardsCommissions/index.asp?nivel=subfoldmenu(0,0
I tried to look up zoning ordinances, as these are public and posted on many city and county websites, but evidently not on this one. You might contact the zoning board via telephone or in person (visit) and get a copy of anything pertinent to the erection of a tower. If you're lucky, there won't be anything, because they won't care! But most aren't quite that lucky.
In *most* places, and the places I've lived, at least a building permit is required for a permanent tower installation. The permit application is completed and filed, and usually a fee paid. Then, they let you know what else is required: Often, a site inspection by a building & safety engineer who reviews the proposed installation and has the authority to approve it or not. If "yes," you get the permit and you're good to go; if "no," you get a chance to appeal, usually via a variance or conditional use permit. That might (not always) require a public hearing.
This all sounds more daunting than it really is. I've been through it a lot of times, and I've installed a lot of towers.
A 40' freestanding tower isn't a big deal and often falls under the height limit requiring any variance; but they might want to inspect the foundation (footing) for the tower, the manufacturer's specification for the tower, its wind load rating at 70 mph or 80 mph (depends where you are) and the load you intend to place on it. This is where buying a "new" tower often helps a lot, because all that documentation (including signed & dated blueprints with a P.E. stamp) is available, whereas on "used" towers, it's often not.
I prefer freestanding telescoping towers, myself. No guy wires, no brackets, just a concrete foundation and the tower itself. Allows one to crank it up or down as needed, and these models can be *VERY* strong -- they have to be, since they're self-supporting.