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A 1/4 wave whip the correct length will typically exhibit slightly low impedance in a mobile set-up, but almost every install is a bit different because body shapes of various cars/trucks, how well it is grounded and were the antenna is mounted influence this.
Most guys installing only have a SWR meter and that is fine, a long as the meter is telling you that SWR is about 1.5:1 the average radio will be happy.
When you get deeper into antennas and start using a antenna analyzer and looking at things more closely there is more to it than just SWR.
The Coil he is using helps to bring the match closer to 50 Ohms at the feed-point.

73
Jeff

[QUOTE="AudioShockwav, post: 388266, member: 6"] A 1/4 wave whip the correct length will typically exhibit slightly low impedance in a mobile set-up, but almost every install is a bit different because body shapes of various cars/trucks, how well it is grounded and were the antenna is mounted influence this. Most guys installing only have a SWR meter and that is fine, a long as the meter is telling you that SWR is about 1.5:1 the average radio will be happy. When you get deeper into antennas and start using a antenna analyzer and looking at things more closely there is more to it than just SWR. The Coil he is using helps to bring the match closer to 50 Ohms at the feed-point. 73 Jeff [/QUOTE]

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