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I’m using a 3-meter long copper pipe with an 0.5 inch diameter. Based on my calculation, there is some improvement about radiating efficiency if i use a big copper pipe with 1.5 inch instead of 0.5 inch.
For 1500 kHz, radiating efficiency is approximately around 0.50% with an 0.5 inch diameter of antenna. With an 1.5 inch diameter of antenna, radiating efficiency is up approximately to 0.60%.
Here in Quebec, a big copper pipe of 1.5 inch of 12 foot long costs around 40$ (35$ US). Remember folks, the length limit of the antenna from your transmitter is 10 foot.
Maybe i will buy a new big copper pipe to experiment this. I think that the main disadvantage is that the big pipe is not light at all.