Suggest you look at this web page to purchase a radar base mount

http://www.craysidemarine.co.uk/ click on the Specials menu and look for
"stainless"

It shows a picture of a base but I know he will make one similar for you

Regards

Dave


"Rob" wrote in message
om...
Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA