[Antennaware] Vertical Dipoles

[David Gould]

This may be slightly off-topic but hopefully not too much!!

I would like to build a vertical dipole for 20m with the bottom about 
1m off the ground, to compliment a beam, to give me a quick 
omni-directional alternative.

What are the potential problems,  or issues to be aware of if I were 
to take the coax feedline down the centre of the tubing that makes 
the lower section of the dipole.  I have seen several alternatives 
where the coax is taken away from the centre of the dipole parallel 
to the ground, but I would prefer not to do this.

Any thoughts gratefully received.  I guess a good feedline current 
choke might be a good idea at the base.

Happy New Year to everyone and thanks for the various help over the years.

73,
Dave, G3UEG