a ground anchor of the same size as that just described may also be used to support a larger post or pole than post p by the use of the adapter shown in fig3 the adapter 25 here is comprised of a cylindrical tube or pipe 26 which has a pair of rings 27 welded to its interior adjacent its ends 28 so constructed the adapter 25 may be slid upon the prop 11 after the ground anchor has been embedded a larger pipe may then be telescoped over the adapter to provide a close fit for stable ground support the ground anchor illustrated in fig1 may also be used to support square shaped rather than cylindrically shaped posts by the use of the other adapter 30 illustrated in fig4 and 5 this adapter is of u shaped construction formed from a strip of metal that is bent into this shape to form two parallel leg portions 31 joined by a bight portion 32 the bight portion is formed with a slot 33 which is sized to receive the spike 15 in use the adapter 30 is placed upon the platform 18 beneath the plate 13 just before the platform is finally driven into place upon the surface of the ground g as shown in fig4 with a channel having been drilled into the bottom of a wooden post p 39 the post is telescoped upon the prop 11 between the legs 31 of the adapter 30 thereby becoming mounted uprightly and secured upon the ground anchor and the ground with reference next to fig6 8.