Tensioning frame for sheet media

The present disclosure is directed to a mounting bracket assembly for displaying a banner including a base plate having a proximal end and a distal end. The base plate includes a first clamping surface, an upwardly-extending stretch arm at the distal end of the base plate, and a vertical channel disposed between the first clamping surface and the upwardly-extending stretch arm. Additionally, the mounting bracket assembly includes a clamping arm removably coupled to the base plate. The clamping arm has a proximal end and a distal end. In some examples, the clamping arm includes a second clamping surface and a downwardly-extending stretch arm disposed at the distal end of the clamping arm. The downwardly-extending stretch arm may be configured to extend into the vertical channel of the base plate. The mounting bracket assembly may further include a cover configured to couple to the base plate over the clamping arm.