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I recall the sliding bar coil thing … there was a lot of commentary. Hey, whatever works!! It kind of reminds me of North Country’s VARIOMETER.
I can’t really comment on diamond monopoles other than my general research which showed they once enjoyed some popularity, but precious few are in operation today. There wasn’t and isn’t enough evidence to say they do any better than a straight monopole, or as compared to using capacitive hats, which is one reason they kind of died out. I have other ideas I want to try, so it’s unlikely, based on my current findings, that I personally will experiment with them, but I don’t want to deter you.
Your idea about multiple pipes spread out at the top is intriguing, but I wonder if it complies, or would it be considered an array where each element has to be counted as part of the total 3m length?
Myself, I’m still intrigued by magnetic antennas because of ease of loading and less space requirement. Reminds me I should get back to working the formulas.