[Q] Antenna construction – How does the shape of air core coils/inductors effect Q?

Good evening,

 

I’m hoping someone can help answer a question I’ve had a hard time finding an answer to, and that’s: Why are air coils almost exclusively cylindrical?

 

Are cylindrical forms more efficient than say… a square/rectilinear coil form? Or a hexagonal?

 

It seems the only exception to the cylindrical coil form is the texas bug catcher, which is octagonal.

 

With the tools in my shop (mill; no lathe), it would be a lot easier to work with non-cylindrical forms. But, does that throw the Q out the window?

 

Thanks and 73

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