An excited 1/2 wavelength antenna produces which fields?

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An excited half-wavelength antenna generates both near-field energy storage and a propagating electromagnetic wave. When the element is driven, charges and currents alternate along it, creating electric and magnetic fields around the antenna. Close to the antenna, energy is stored in these fields as reactive energy, which resembles an electrostatic field in behavior even though it is time-varying. As you move farther away, the changing currents produce a traveling electromagnetic wave, with electric and magnetic fields perpendicular and in phase, that radiates energy away. So you have the non-radiating, electrostatic-like near field and the radiating electromagnetic far field.