Dave wrote:

...
A "counterpoise" is not a ground plane.
...
"Buckets of irony littered the lobby"

Oh no, here we go again with more magical/mystical antenna physics and
supernatural powers ...

Generally, a ground-plane is not referred to as counterpoise, but it
certainly IS one; it "balances" an unbalanced antenna by providing the
mechanics where the counterpart of the wave may be mirrored.

And, although every ground-plane IS a counterpoise, not every
counterpoise need be a ground plane ... again, DUH!

Regards,
JS