about a reel not shown contained within the enclosure 36 at the base of the post 22 a drive means such as a conventional reversible electric motor not shown is also contained within the enclosure 36 the motor is operably connected to the reel on which the hoist line 26 is wound a control mechanism such as an electrical control box 38 hangs from the outer end of a rigid conduit 40 that projects out the free end 32 of the arm 30 the control box 38 includes an electrical switch that is wired to the motor contained within the enclosure 36 the switch operates the motor to rotate the reel in either rotational direction to extend and retract the hoist line 26 connected to the hoist line 26 is a yoke structure 42 the end of the hoist line 26 is attached to a swivel connector such as a swivel hook 36 which is hooked through an opening 44 defined at the center of a horizontally elongated t shaped cross member 46 the cross member 46 and thus the entire yoke structure 42 is rotatable about the vertical axis of rotation defined by the swivel hook 36 the cross member 46 is formed of two l shaped members fastened on opposite sides of a planar center member or spacer a series of spaced fastener holes 48 are defined along either end portion of the cross member 46 fastened or bolted to the cross member 46 through fastener holes 48 are vertically elongated downwardly extending.