So do you suppose the original poster has an IEEE dictionary?

Roy Lewallen, W7EL

W5DXP wrote:
Roy Lewallen wrote:

If by omnidirectional you mean truly the same in all directions, up,
down, and in azimuth, the answer is no.


From the IEEE Dictionary:

"omnidirectional antenna - An antenna having an essentially non-
directional pattern in a given plane of the antenna and a directional
pattern in any orthogonal plane. Note: For ground-based antennas, the
omnidirectional plane is usually horizontal."

"isotropic radiator - a hypothetical, lossless antenna having equal
radiation intensity in all directions."