You wanted 3m so I gave you 3m. Wowsers:
Just above the TV antenna I have the tall pole (about 1.25" diameter) split so I can lift it off and access the Sky to change batteries. It’s aluminum tubing, which had a prior life (is recycled) somewhere on top of Mount Wellington I believe:
I don’t have guy wire so it so I will wait and see how well this stands up to high and gusty winds. Expecting some soon in fact.