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Have you nailed down that it is the trombone causing the skewing Eddie ? 

i don't recall other models of 5/8wave that have conventional matching or no matching showing a pattern like your free space model,


i remember years ago somebody claiming the trombone will cause a skewed pattern,

strange that it almost goes away when you add the isolated mast over real ground,


The Shockwave 5/8 has symmetrical radials & the trombone is not aligned with the radials.