Hi
Welcome.
We need much more info on what you intend to make before advice can be reliably given.
Ie.. active pre amped no tune loop antenna,( ie lz1aq type,) high q tuned? Dia of loop, frequencies of interest etc etc.
However, in general there is no such thing as too big a tube diameter.( dia of tube not loop.) Its usually limited by what you have/ can get/ bend/ not worth the effort due to no real world gains, etc.
A name to call you?
Regards Simon g0zen
