Abstract: A universal mounting stake assembly for installing one or more electrical junction boxes, terminal boxes, or Subscriber Network Interfaces (SNI's). The assembly comprises a specially configured ground engaging stake, an appropriately configured receiving plate adapted to be coupled to the stake, and an optional driving cap. The stake includes a plurality of regularly spaced apart plate receptive notches, a service wire receptive channel longitudinally coextensive with its length, and a plurality of regularly spaced apart stud receptive fastener orifices for locating a stud which will secure the plate after installation. The plate comprises a variety of adaptably configured orifices enabling a variety of SNI or similar devices to be easily affixed thereto. The receiving plate is attached to the stake by fitting its tabbed, flanged end to an appropriate user selected pair of stake notches.