An antenna that radiates and receives energy equally well in all horizontal directions is an omnidirectional antenna. An antenna also has the ability to focus energy in a particular direction. An antenna that has this capability is a directional antenna. Omnidirectional antennas, as the description suggests, are best suited for applications requiring good all round coverage. On the other hand, for some applications, all-round coverage is either not required or it is desirable to be able to focus the available energy radiated by the antenna in some particular direction. This will dictate the choice of antenna.
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