And the common quarter-wave wire whip so often seen at the masthead uses
the mast itself as the counterpoise.

If you have a metal vehicle like a car then you can let
the conductive body of the car replace the four horizontal stubs (also
called the ground plane). This is why you see so many car antennas with
only the single quarter wave stub sticking up. They are using the metal
body of the car as the lower half of the antenna.