PURPOSE: To construct a parabolic antenna onto a parapet with a step difference by placing the 1st and 2nd concrete blocks onto a slab face in the inside of the parapet, placing an antenna pole seat while bridging over them, supporting a middle part of an antenna pole and inserting its root to a metal placed on the slab.

CONSTITUTION: Two concrete blocks 10, 11 are placed side by side on the slab face 2 in the inside of a straight line part or a corner part of the parapet 1 and the parapet 1 and the slab face 2 are fixed and the antenna pole seat 20 is fixed to the concrete blocks 10, 11 while bridging over them. A pipe connecting plate 50 is supported by two support metals 40, 41 fixed to the parapet 1, the parabolic antenna pole P whose base is placed to the slab is inserted through the antenna pole seat 20 and the pipe connecting plate 50 and the parabolic antenna is tightened by tightening metallic fixtures 54, 55 of the pipe connecting plate 50. Thus, the parabolic antenna pole P is easily fitted to the parapet 1 with a step difference on the rooftop of a building.