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That will not produce the RF ground effect you want. They should be radials about the base of the antenna and coil, just as MRAM has indicated for his system, although I’d make at least 12, and as long as you can fit on your roof. If your metal conduit is somehow grounded to actual Earth, then bonding the set of radials to it might (I say ‘might’) work for you, provided there is no loop effect that could goof up your audio.
What you’re trying to do is make a ground radial system to cover as much of the near field (approx .17 wavelength) as you can for the upper portion of the BCB.
How are you tuning your system to resonance? What are you measuring with?
You must tap the coil properly. Do not modulate (no audio). It isn’t always easy, sometimes you get a false reading at an overtone frequency. After you max that out, you have to fine tune by changing the length of the antenna by moving it up and down in the slotted lower section until you get it to peak. I did mine at 1/4″ intervals … took a long time. Ended up where one Sharpie penline width made a difference.
3 basic things, then:
1) Maximum loading on an empty frequency in the uppermost portion of the BCB.
2) Maximun resonance, which requires patient matching for most field strength.
3) Maximum RF ground.
These 3 all affect each other, so finding a balance that works for you is where your brains and elbow grease come together 😉