Antenna
An antenna is a device to transmit and/or receive electromagnetic waves. Electromagnetic waves are often referred to as radio waves. Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. An antenna must be tuned (matched) to the same frequency band as the radio system to which it is connected otherwise reception and/or transmission will be impaired.
Types of antenna
There are 3 types of antennas used with mobile wireless, omnidirectional, dish and panel antennas.
+ Omnidirectional radiate equally in all directions
+ Dishes are very directional
+ Panels are not as directional as Dishes.