I wanted to thank everyone for taking the time to respond to this.
I spent the day today working on an HF Terrain Analysis - specifically for VK, ZL, and JA DX.
Looking at that, I think I'm starting to get a picture of the issue.
For VK DX - it looks like there is a terrain obstacle.
And that is coupled with very poor ground reaching out many wavelengths.
It makes sense that low TOA is called for.
And in this case the lower the TOA, the more detrimental the ground effect is going to be.
And this appears to be confirmed - as verticals have always been poor performers here over the years.
All of which seems to indicate that increased height with horizontal polarization is probably going to be the most practical approach.
Thanks everyone again for your expertise and thoughtful responses!
Duane - N1BBR
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