Sorry no-one's come "out of the woodwork" until now.
It depends what you want to do with it.
Personally, I have made and use an inverted "Delta Loop," using 2mm galvanised steel wire rope that works very well.
Aperture size in relation to frequency range coverage should be considered.
This is an extract from one of Chris's messages:"Usually I would recommend a loop of 1m or 3ft diameter so that it covers the full HF spectrum up to 30 MHz."
Also, although galvanised wire works for me, it may well be better to use copper (or aluminium).