[Antennas] Variation on coaxial dipole antenna

[Mel Vance]

> to tube diameter gets to be very very big.  The
> engineers try to tweak this by flairing the bottom
> end of the tube, like "Isopole TM" did back then.
> 
Going to sound like I am nit picking, but hope you do not take it that way......

The 2 cones on the ISOPOLE antenna are for decoupling the lower 'support' part of the 
mast from the upper 'radiator' part of the mast. That method for decoupling the mast has 
been covered in past ARRL antenna handbooks. Do not have/have not read any of the 
more recent copies.

Some versions of the Ringo Ranger also use decoupling on the feed line. They use three 
1/4 wave radials 1/2 wave from the antenna feed point.

Mel
N7OKL