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Eddie,

Vortex used custom made tube with oddball unequal taper steps,


http://www.vortexantennas.co.uk/shop/category/accessories/aluminium-tubing-6082-t6-or-aa6082-t6/,


I don't know the offset at the base of the cone, but looking at oggy's video the radials are 20mm so the offset is at least 25mm maybe 30mm,


I have not done any tuning & testing today so nothing to report at the moment.