In article ,
Roy Lewallen wrote:

An antenna radiates at all elevation angles. It does not "put out" at
any single angle. Likewise, it receives signals from all elevation
angles, not just a single one.

Roy Lewallen, W7EL

Roy, You know better than to make the above "Statement". It is way to
"General" in nature. Certainlky there are a whole raft of "Antennas"
that have both Horozontal and Vertical Beamwidths, that are NOT
Omnidirectional. The OP didn't specify the Frequency at which the
"antenna" was being used at, and the "Higher" the frequency the more
likely the antenna will NOT be OmniDirectional, and will have Horozontal
and Vertical Beamwidths.......