In article ,
Wimpie wrote:

I know the "classical" definition, but we live in 2014, and when the
scope of some definitions changed over the last 20..30 years, it is
good to know how they changed to avoid misunderstandings. Visit some
antenna manufacturer's websites and see what changed over the years
(that doesn't mean that I agree with them).

1. There are industry standards, but some antenna manufacturers use
numbers and definitions to make their products more attractive. That
has not changed over the last many years.

2. The feature that defines a ground plane antenna is the ground plane,
not the vertical element.

3. Ground is relatively flat. Drooping radials to approximate a sleeve
dipole is stretching the definition of a ground plane!

Fred
K4DII