And to make them even better to the eye, 45 degree plumbing elbows are available.
https://www.screwfix.com/p/flomasta-...Fca1UQod4pQN4Q
An octagonal loop would be very art deco.
And along with a cross tee
https://www.ebay.co.uk/itm/15mm-22mm...-/282125022751 at the top a double loop could be made.
I fancy doing this rather than rotating my Wellbrook, all I need is some electronic way of rotating it. I do have power and data (three core cable currently supplying a heavy duty radio control servo which swings the loop in less than a second, great for nulling interference) and only one co-ax to the aerial so it needs to be done at the antenna.