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"Above ground" doesn't necessarily mean measured from the lawn or soil directly below the feedpoint.  It means above the actual RF-conducting depth, which depends on several things, including just where you are.


If you're in the Navy, out on a ship, then "above ground" can be measured from the surface of the ocean, OR from the deck on a larger ship such as an aircraft carrier.  If you're out in the southwest desert, the water table is really deep in places, and that makes for a really deep ground.  Places in central-to-east Texas have some of the best soil conditions for antenna work.