[Elecraft] What Vertical Antenna Do I Need?

[Stuart Rohre]

For Fred's antenna need:

I would investigate the Force 12 vertical antennas.  I have used several of 
the Sigma 5 model, (20 to 10) on science projects and they are durable, easy 
to set up and take down, and work with high efficiency, equal or better to, 
a dipole of full size.  They are bar loaded, with center matching coils and 
remote switching for the high bands in model Sigma 5.  There are also 40 
meter capable models.  They are true vertical loaded dipoles, thus requiring 
NO auxiliary ground wires, radials, or counterpoises.  They are coax 
fed,with bead chokes on the coax so that bringing off the coax from the 
center is not a problem.

See the Force 12 web site for the DX contest performance of Sigma verticals. 
They were also written up in the ham magazines with favorable results.

-Stuart
K5KVH