Abstract: A spring hanger system for supporting a rectangular waveguide on a transmission tower or other structure, including a plurality of vertically spaced spring hangers, each adapted to engage and support a section in the vertical run of the waveguide. Each hanger includes (1) a lateral support guide for restraining the guide from any appreciable movement in all directions except vertical, and adapted for fixation to the supporting structure; (2) a gripping frame adapted to grip tightly the outer periphery of the waveguide without seriously deforming same, the gripping frame being spaced vertically below the lateral support guide; and (3) a relatively constant force spring mechanism connecting said gripping frame to said lateral support guide, thus allowing the waveguide to move upwardly and downwardly with variations in temperature without substantially changing the top loading on the tower.