What beam is that?

A couple of months ago we put a 3 element Yagi antenna on the VK3SCG JOTA station tower at Gilwell Park but I’m trying to find some info about the antenna.
I’ve posted four photos here in the hope that somebody might recognise the design. At best guess the boom is about 4 m long. Along the boom toward the director is a parallel tuning arrangement made of two aluminium tubes about 8 mm in diameter and about 40mm apart.
Each trap has two drain holes that need to point downward.

Any ideas, please leave me a comment below.

Yagi on the ground after assembly
Yagi being assembled, viewed from 30m above.
Yagi about to be hoisted up the tower
Parallel tuning arrangement


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