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Rohde & Schwarz
Precision Halfwave Dipole Set, 30 MHz to 1000 MHz
Antenna calibration, critical cases of field-strength measurement and the testing of antenna-calibration and field-strength measurement sites require special measures for establishing test standards. At both the balanced and unbalanced sides of the balun, Dipoles
As a consequence, a pair of dipoles coupled head to head will always have an exactly calibrated attenuation.
Halfwave dipoles are especially important in the VHF/UHF range because they show the same radiation pattern at all frequencies. This is due to the fact that the dipoles are tuned to 0.5 λ and have characteristics which can be defined exactly if the elements are sufficiently thin.