inch and tip member 66 is about 5 8 inch in diameter anchor 20 may be installed in the ground at any desired angle from about vertical to as much as 80 u00b0 after securement of rod 78 to connector 24 a tubular wrench is telescoped over rod 78 in disposition with the drive end thereof received in cavity 36 of hub 26 an exemplary wrench is shown for example in the assignee 39 s u s pat no re 32 076 the wrench is then connected to the kelly bar of a drive motor mounted on a digger derrick unit or similar machine down pressure is placed on the anchor 20 resting on the ground at the desired angle as anchor rotation is initiated the relatively pointed shape of spade portion 30 presented by tip section 64 and tip member 66 if present allows the operator to relatively precisely position anchor 20 at the exact point where it is desired to drive the anchor into the ground this precise positioning is especially important in relatively dense or frozen soils where walking of the anchor on the surface of the ground might otherwise occur furthermore the generally tapered shape of spade portion 30 the extended length thereof and the angularity of the cutting edges defined by margins 56 and 58 of portion 30 allows the operator to install anchor 20 at significant angles with respect to the vertical without danger of walking the shape and length of spade portion 30 prevents the outer margin of the helical element 28 from engaging the ground during initial rotation of the anchor which would contribute to the tendency of the anchor to walk on the surface before it penetrates the soil to a depth to preclude such lateral.