The 5/8 wave antenna is typically fed against a ground plane (car roof) and is usually matched with a tapped inductor. Half of this antenna is 5/8 wave and is a common length for 2m mobile antennas. This antenna can be matched to 50 ohms by using a series inductor. Notice that the radiation resistance (impedance) is about 90 ohms. This is called an Extended Double Zepp antenna and produces the maximum gain possible from a simple center-fed dipole.
When a half-wave dipole is close to ground, the impedance is lowered to near 50 ohms. Radiation pattern shown is typical figure-8 pattern.
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