Yes NEC is a antenna calculation program.
Try the Parker website and you will find the fittings I'm thinking about (
there is a similar type called swage lock)

Here is an example of an dual band j-pole
http://www.durm-online.de/jpole.htm
I have seen several variations of this design, but can't find any of the
links.

Geir

wrote in message
oups.com...

geir knutsen wrote:
I would suggest that you get someone to calculate the antenna with
NEC or
similar to get the right lengths and resistive loss. Then build an
prototype
for 2m and 70cm and put it on eBay to check if there is any interest
for the
antenna. To reduce the size it might be an idea to think about using
Parker
tube fittings in some of the joints.

73
Geir

I really appreciate the advice! What is "NEC"? I assume it is an
antenna performance computer program?

Are you saying build a dual band prototype of one for each band?

What are "Parker tube fittings"?




wrote in message
oups.com...
I really like to build things. I can weld even small material with a
mig welder I have at home. You mentioned building a j pole. I
thought
of doing this myself. To be honest, I have always wanted to make
something, (not necessarily an antenna) that I could sell for a few
extra dollars on ebay or something. I wonder if a person could make
any
money building antennas and doing that? I am not wanting to get
rich
but I like building things and I could use some "pocket money". We
just
had our second shild born yesterday. It is my first son!

I thought about making a j-pole out of stainless steel tubing. It
seems
this would be attractive because of it being rustproof and to me
more
"visably appealing" that a copper one after it become tarnished.
But
some people have told me there is more resistance in stainless than
copper. SOmeone else told me it would not amount to much in ham
use.

Thought about building yagis too.

The only problem would be figuring out how to ship an antenna where
it
would not cost much.