The "RT" Series Tower Sections had cross bracing segments that spanned from one Tower Section to the next.
The "RTL" Series Towers Sections feature cross bracing that starts,stops and is totally contained within the same Tower section; making it easier to assemble a complete tower section on the ground for lifting and easier attachment/fitting to the next Tower Section during erection.
Things to keep in mind when ordering a Rohn RT Tower Kit:
Items That ARE Included
Optional Items That ARE NOT Included