Steve,

25 mm is rather skinny to go 8.3 meters with. However, the following should
work. I assume the tubing is available in 3 meter lengths. 10 foot lengths
would be even better.

Get four 3 meter pieces, and cut one down to 2.3 meters. Now bolt and center
this 2.3 meter piece to the side of one 3 meter pieces. The 2.3 meter piece
will be the top of your antenna, the 3 meter piece the bottom. Now bolt the
remaining 3 meter pieces to the bottom piece, and you should have an 8.3
meter boom. Whatever you do, do not use brass or copper hardware. You might
want add a strap to the top side where each of the 3 meter pieces butts up
to the 2.3 meter piece.

Tam/WB2TT

"Steve" wrote in message
...
I'm intending to have a go at building this antenna. The only problem I
have
is that I cannot find a supplier of aluminium tubing that stocks single
lengths long enough for a 8.3 metre boom. I therefore need to join two
lengths of 25 x 25mm square tube together. Any one recommend a suitable
method of doing this please ?. I'd rather avoid welding as I would have to
buy the kit to do it.

Regards

Steve