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5/8 Wave Vertical Mobile Antenna
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The 5/8 wave antenna consists of a vertical radiator which is fed at the base.
A matching device must be added between the antenna and the feed line if you wish to feed it with coax.  

Adding a coil at the base in series with the antenna works quite well for mobiles antennas.
I have a good Detailed 5/8 wave mobile antenna Excel Program that will
calculate all the dimensions and coil taps for you.  Download File  5/8 mobile ant.