User`s guide

Radio Signal Propagation
C-5
Omni-directional Antenna
Radiates and receives equally in all directions in azimuth.
The following diagram shows the radiation pattern of an
omni-directional antenna with its side lobes in polar form.
Figure C-3: Radiation Pattern of an Omni Antenna - Side View
Figure C-4: Radiation Pattern of an Omni Antenna - Top View
Directional Antenna
Radiates and receives most of the signal power in one
direction. The following diagram shows the radiation pattern
of a directional antenna with its side lobes in polar form: