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That's the drawback of SWR versus Resonance - the "Resonance" is exactly true at the 1 specific frequency - can't change that either.

But SWR? It is in the Feedpoint.

Put a simple Firestick on a car - using a simple 6" Mag mount and "Thunk" it around on different spots of the car - with the SWR meter to look at it "match" as where it's mounted. The vehicle isn't changed, nor the antenna - but the location of the antenna on the vehicle is different so it changes the Feedpoint impedance at that spot - and changes the SWR at those locations.

So lot of this deals with not just length - but location (as to where it's placed and what it's placed over) so the length can work with the counterpoise image - how well it does that, does affect Feedpoint impedance and therefore SWR changes. .

<blockquote data-quote="Handy Andy" data-source="post: 777581" data-attributes="member: 52309">That&#039;s the drawback of SWR versus Resonance - the &quot;Resonance&quot; is exactly true at the 1 specific frequency - can&#039;t change that either.But SWR? It is in the Feedpoint.Put a simple Firestick on a car - using a simple 6&quot; Mag mount and &quot;Thunk&quot; it around on different spots of the car - with the SWR meter to look at it &quot;match&quot; as where it&#039;s mounted. The vehicle isn&#039;t changed, nor the antenna - but the location of the antenna on the vehicle is different so it changes the Feedpoint impedance at that spot - and changes the SWR at those locations.So lot of this deals with not just length - but location (as to where it&#039;s placed and what it&#039;s placed over)&nbsp; so the length can work with the counterpoise image - how well it does that, does affect Feedpoint impedance and therefore SWR changes. .</blockquote>

[QUOTE="Handy Andy, post: 777581, member: 52309"] That's the drawback of SWR versus Resonance - the "Resonance" is exactly true at the 1 specific frequency - can't change that either. But SWR? It is in the Feedpoint. Put a simple Firestick on a car - using a simple 6" Mag mount and "Thunk" it around on different spots of the car - with the SWR meter to look at it "match" as where it's mounted. The vehicle isn't changed, nor the antenna - but the location of the antenna on the vehicle is different so it changes the Feedpoint impedance at that spot - and changes the SWR at those locations. So lot of this deals with not just length - but location (as to where it's placed and what it's placed over) so the length can work with the [I]counterpoise[/I] image - how well it does that, does affect Feedpoint impedance and therefore SWR changes. . [/QUOTE]

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