We bought this set after our kids had a fun experience with tetherball on a recent camping trip.  It comes with a 12" sleeve that gets cemented in the ground and the pole then slides in/out for use or storage.  We dug a hole 12" deep by 9" wide in the back yard.  After taping off the bottom of the sleeve we placed the bottom half of the two-piece pole into the sleeve and centered it in the hole.  We used string, tent stakes and a level to make sure the pole was plumb, then mixed the concrete and poured.  After setting for a couple of days it was ready to go.  We just pumped up the ball, tied it to the eyelet at the top of the upper pole and connected the two poles.  We did find that the ball was hanging low so we adjusted the tie-off.