it is inserted into a hole in the ceiling the flange 118 rests flush against the ceiling to prevent further movement of the anchor 112 into the ceiling during an anchor installation process the anchor 112 also has a tapered threaded internal bore 120 for receiving the hanger bolt 114 the hanger bolt 114 which is threaded along its entire length has an upper tapered end 122 configured for mating with the tapered bore 120 in the anchor 112 and a lower end of constant diameter that forms a stud 146 for receiving the retaining clip 18 it should be noted that the anchor 112 is not necessary if the hanger bolt 114 is attached directly to a stud or other rigid structure the telemetry antenna 12 is installed using the retainer 110 of fig5 in the following manner first a hole not shown is drilled in the drywall or masonry surface also not shown at the appropriate location the anchor 112 is then inserted into the hole so that the flange 118 rests flat against the ceiling an acorn nut 124 is then screwed onto the stud 146 formed by the lower end of the hanger bolt 114 and the tapered upper end 122 of the hanger bolt 114 is inserted into the anchor 112 the acorn nut 124 is then turned to firmly screw the hanger bolt 114 into the anchor 112 the acorn nut 124 is then removed from the hanger bolt 114 without loosening the hanger bolt.