Design and Construction4. The design of towers shall be in accordance with the specifications contained in the NCA-approved structure. In designing towers, due cognizance shall be taken of the following:1.        Tapered steel and flanged steel poles feature designs that blend well into the environment and require minimum space for installation.2.        Flanged steel poles are easy to handle and install.3.        Connections shall be precision-fitted to allow quick assembly of modular sections and the top platform, side arms or mounting frame.4.        Pole sections shall be made with identical base flange plates to permit simplified modifications of mounting heights and antenna reconfigurations.5.        Tapered steel poles have comparatively smaller base diameters and so demand minimal land space.   tapered poles can be installed quickly and offer an extremely efficient strength to cost ratio.