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Question:

Is Aluminium tube and wire is good for radiator elements for building 2.4 GHz Omni Collinear antennas?

usually radiator elements omni collinear was made by copper or brass tube and wire.

Answer:

Aluminum tube is used for constructing bigger antennas such as for 2 meters or higher wavelength bandIn case of 2.4 Ghz antenna your wavelength is so short so that using a tube is mechanically impossibleYou have to use a flexible wire that will not easily brokenThis is why for these small antennas brass and copper are usually used.
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