The most widely used class of antenna, a dipole antenna consists of two symmetrical radiators such as metal rods or wires, with one side of the balanced feedline from the transmitter or receiver attached to each. A horizontal dipole radiates in two lobes perpendicular to the antenna's axis. A half-wave dipole the most common type, has two collinear elements each a quarter wavelength long and a gain of 2.15 dBi. Used individually as low gain antennas, dipoles are also used as driven elements in many more complicated higher gain types of antennas.

Questions and answers:
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Q: What is the most widley used antenna class?
A: dipole antenna', '
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            What radiates two lobes perpendicular to the antennas axis?                                                                                                                                       
A: horizontal dipole', '
Q: Besides low gain antennas, what is also used as driven elements in complicated higher gain types of antennas?
A: dipoles', '
Q: How much gain does a half-wave dipole have?
A: 2.15 dBi']