Locking clip for a billboard sign tensioning system

A clip usable in a cable tensioning system for engaging and removably retaining a portion of a sheet to be stretched to a tensioned cable, the clip comprising:

• a. a top plate having a top surface and a bottom surface, said top plate tapering from a front edge to a rear edge;
• b. a hook extending upward from said top surface near said rear edge, said hook defining an open channel adapted to receive a portion of said cable;
• c. a base plate comprising a bottom surface and a top surface having a gripping surface;
• and,
• d. a pair of opposing retaining arms extending upward from said base plate top surface, each arm having an angled portion angled toward the other arm with each angled portion terminating in an end spaced from said base plate top surface,
• whereby said tapering top plate is adapted to slide over said base plate with said hook passing between said opposing retaining arms and with said ends of said opposing retaining arms being adapted to engage said top plate top surface to lock said top plate against said base plate so as to grip said sheet.