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I haven't read this whole thread in detail, but if you're seeing a "high" SWR using a typical mobile antenna which probably has a feedpoint impedance somewhere around 30-40 ohms, you probably don't want to use RG-59. RG-59 has a characteristic impedance of 75 ohms, which will generally result in a higher SWR with a 30-40 ohm antenna than RG-58 will.

And you can't make a blanket statement as I read on this thread that a mobile vertical antenna has a 40 ohm (or 35, or 30) impedance. It depends on the installation, amount of ground plane, and a large number of factors.

[QUOTE="Beetle, post: 394553, member: 1066"] I haven't read this whole thread in detail, but if you're seeing a "high" SWR using a typical mobile antenna which probably has a feedpoint impedance somewhere around 30-40 ohms, you probably don't want to use [B]RG-59[/B]. RG-59 has a characteristic impedance of 75 ohms, which will generally result in a higher SWR with a 30-40 ohm antenna than RG-58 will. And you can't make a blanket statement as I read on this thread that a mobile vertical antenna has a 40 ohm (or 35, or 30) impedance. It depends on the installation, amount of ground plane, and a large number of factors. [/QUOTE]

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