The correct answer is A: It has more gain than a 1/4-wavelength antenna. An advantage of a 5/8 wavelength whip antenna for VHF or UHF mobile service is that it has more gain than a 1/4-wavelength antenna. In mobile use, a 5/8 wave vertical is popular because its radiation pattern puts more energy at lower angles than a 1/4 wave, which can improve useful range. It is important not to confuse this with physical length: a 5/8 wave antenna is longer than a 1/2 wave antenna, not shorter. The advantage is its pattern and gain relative to a 1/4 wave whip, not that it saves space versus a 1/2 wave antenna. Understanding this helps when selecting mobile antennas.