Contrast an omnidirectional antenna with a semidirectional antenna.

What will be an ideal response?

Unlike an omnidirectional antenna, which evenly spreads the signal in all directions, a semidirectional antenna focuses the energy in one direction. Generally, a semidirectional antenna will only transmit its signal no more than in a half-circle (180 degrees).  For outdoor applications, semidirectional antennas can be used for short- and medium-range remote wireless bridge networks, such as in a point-to-point configuration in which two buildings are connected through a wireless network. Although omnidirectional antennas can be used in an outdoor configuration, omnidirectional antennas are more commonly used for indoor WLANs.