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A dipole is basically a length of wire split into two portions and fed at the split. It has a nominal 3dB gain over an isotropic source and is directional broadside to the wire. The dipole is an electrical half wavelength of wire at the frequency of interest. The impedance under this condition is theoretically 72 ohms resistive and is a good match to a 50-75 ohm source or load for equipment designed to work into this range of impedances.
Enter the desired frequency and select the desired calculation from the drop box. Click on Calculate and the optimum length for that combination will be displayed in feet and inches and in meters.