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[Antennaware] 40M Yagi Problem

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Subject: [Antennaware] 40M Yagi Problem
From: "Stan Stockton" <>
Reply-to: Stan Stockton <>
Date: Sun, 16 Nov 2003 19:37:02 -0600
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Thought I would solicit some advise from some experts.  

New 3 element 40M yagi at 70 feet  -  I get two dips - something like 6850 and 
about 7200 when looking at the impedance with an MFJ-259B.  I DO NOT get that 
double dip when looking at the top antenna which is at 150 feet.  The top one 
is about 42 ohms at 7000, about 50 ohms at 7075 and probably about 75 ohms at 

There is definitely something wrong as I have NEVER yet seen a European which 
is as strong on both antennas fed in phase as the upper one by itself.  The 
bottom one by itself is down by something like 5-10 DB on the long haul stuff 
(guessing, comparing the two antennas) which is okay.  Have not put up a dipole 
to see if it is any better than that.  

The guy wires shouldn't be a problem although they are not eliminated as being 
the cause just yet.  If anyone has experienced this kind of matching problem or 
interaction problem that caused the antenna to have two distinct places in the 
band where the impedance approached 50 ohms or has any suggestions as to what 
list of things to do to solve this problem, I would appreciate hearing from 
you.  I know what I am going to try first, second, and third but not sure what 
else to put in there before I get to about 10 when the antenna comes down for 

Stan, K5GO
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