A structural support for supporting equipment on a rooftop, which is connected to a frame and to equipment to be supported, comprises a mechanism connecting a base cap and a base connector of the structural support. One of the base cap and the base connector includes at least one plate and the other of the base cap and the base connector includes a pair of plates that receives the at least one plate allowing for pivoting adjustments of the base connector about the base cap when the at least one plate is received within an opening between the pair of plates to achieve desired positioning of the base connector. In one example, a pair of base cap plates is received by a pair of inwardly biased base connector plates. Once a desired position is achieved, a fastening assembly secures the position of the base connector. The structural mounting may also include, for example, a base support, a base flashing, and a rubber base gasket.