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If its from your multimeter then don't waste your time as it measures DC and not RF. You need an antenna analyser.

Correct.

Not even close. The ground starts at the mount. The whole idea is we want RF to flow over as best a conductor it can rather than the lossy ground. Ideally you'd have a large sheet of horizontal metal there, ie the roof of the vehicle. The ladder rack is not a large sheet of metal, its a small bit of box section.

No. The rain affected the antenna making it appear electrically longer to RF. RF flows on the surface of a conductor so anything touching that surface, whether it be insulation or water affects how RF travels over it.

Don't worry, its a very complicated subject. I'm trying to find a way to explain without getting into a lot of theory but I can't. Suffice to say its probably better just concentrating on best practice than the hows and whys.

Read the following:
http://k0bg.com/ground.html
http://k0bg.com/antmount.html
http://k0bg.com/bonding.html

<blockquote data-quote="M0GVZ" data-source="post: 534071" data-attributes="member: 22312">If its from your multimeter then don&#039;t waste your time as it measures DC and not RF. You need an antenna analyser.Correct.Not even close. The ground starts at the mount.&nbsp; The whole idea is we want RF to flow over as best a conductor it can rather than the lossy ground. Ideally you&#039;d have a large sheet of horizontal metal there, ie the roof of the vehicle. The ladder rack is not a large sheet of metal, its a small bit of box section.&nbsp; No. The rain affected the antenna making it appear electrically longer to RF. RF flows on the surface of a conductor so anything touching that surface, whether it be insulation or water affects how RF travels over it. Don&#039;t worry, its a very complicated subject. I&#039;m trying to find a way to explain without getting into a lot of theory but I can&#039;t. Suffice to say its probably better just concentrating on best practice than the hows and whys. Read the following:<a href="http://k0bg.com/ground.html" target="_blank">http://k0bg.com/ground.html</a><a href="http://k0bg.com/antmount.html" target="_blank">http://k0bg.com/antmount.html</a><a href="http://k0bg.com/bonding.html" target="_blank">http://k0bg.com/bonding.html</a></blockquote>

[QUOTE="M0GVZ, post: 534071, member: 22312"] If its from your multimeter then don't waste your time as it measures DC and not RF. You need an antenna analyser. Correct. Not even close. The ground starts at the mount. The whole idea is we want RF to flow over as best a conductor it can rather than the lossy ground. Ideally you'd have a large sheet of horizontal metal there, ie the roof of the vehicle. The ladder rack is not a large sheet of metal, its a small bit of box section. No. The rain affected the antenna making it appear electrically longer to RF. RF flows on the surface of a conductor so anything touching that surface, whether it be insulation or water affects how RF travels over it. Don't worry, its a very complicated subject. I'm trying to find a way to explain without getting into a lot of theory but I can't. Suffice to say its probably better just concentrating on best practice than the hows and whys. Read the following: [URL]http://k0bg.com/ground.html[/URL] [URL]http://k0bg.com/antmount.html[/URL] [URL]http://k0bg.com/bonding.html[/URL] [/QUOTE]

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