Abstract: A tower characterized by a rigid, self-supporting structure which includes a set of vertically oriented outside legs arranged in a generally triangular configuration and a set of vertically oriented inside legs also arranged in a generally triangular configuration and positioned adjacent the outside legs, which outside legs and inside legs are fitted with a plurality of generally horizontally disposed braces and are supported in spaced relationship by a plurality of collars also oriented in generally horizontal and spaced relationship along the length of the tower. In a preferred embodiment the outside legs and inside legs are fastened to the collars by means of flanges.