Google Carbon Fiber Tubing, and you will get a lot of vendors who can probably 
deliver 
carbon fiber tubing from stock.
However, thinking it through, I bet you open whole new tricky materials/design 
problem.  Carbon fiber
probably demands special methods of attachment, drilling, fittings, UV 
resistance, etc,  different from aluminum, 
in the boom/ antenna application.
All the Best, 73
Pat Barthelow     aa6eg@hotmail.com
http://www.jamesburgdish.org
Subscribe: http://bambi.net/jamesburg.html
Jamesburg Earth Station  Moon Bounce Team
> Jeffrey Okamitsu wrote:
>> Has anyone ever thought about using carbon fiber
>> composite as boom material for a really big array?
>> 
>> Strength to weight ratio of the material is, of
>> course, fantastic.  However...it would be very
>> expensive.
>> 
>> I'm interested to hear if anyone has attempted
>> something like this.
>> 
>> 73, Jeff W3KL
>> 
>> 
>>        
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