9. Triangular designs have greater resistance to twist, since the square members can 'rack' and the triangular members cannot, thus proving very advantageous for microwave dish supports.

10. From the standpoint of deflection and twist, the triangular pipe tower is stronger and more rigid pound for pound.

11. With round main members (legs) equipment such as dish mounts, platforms etc. are mounted with 'U' bolts, and therefore can be moved from location to location without drilling additional holes in the structural members of the tower. Antenna mounts for example can be added to the structure without any field punching, drilling or welding.

12. There is an old fashioned argument that pipe members corrode from the inside, and since the corrosion is hidden, it cannot be maintained or corrected. Back when pipe members were first used in construction, the material was not hot dip galvanized inside after fabrication. With today's modern fabrication procedures and galvanizing technologies, this condition does not exist. Back to back angle members can also corrode from the inside, and cannot be maintained. The secret is in the fabrication/galvanizing procedure.

13. Round member pipe/solid towers can be designed with single piece main structural members. Angle towers require 'back to back' bolted or welded members to attain the strength required for some of today's tremendous antenna loads and tower heights.