Dipole antenna is basically a omni directional antenna. The radiation pattern of a dipole antenna is given below:
Antennas used in mobile communications like GSM are normally Directional antenna. The raidation patterns will be such the power will not be radiating in all directions.
More details at http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/prod_white_paper0900aecd806a1a3e.html
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