[Antennaware] 40M Yagi Problem

[Stan Stockton]

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 7200.  

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 evaluation.

Stan, K5GO