Topband: Top Hat Vertical

[Jim Brown]

Hi Ed,

The height of my Tee vertical was determined by the rigging points in 
trees to support the ends, with the design guideline that higher is 
better. :) The length of the top was then determined by what it took to 
get that 50 ohm match.

73, Jim K9YC

On Wed,7/1/2015 2:35 AM, Ed Sawyer wrote:
> “Same here. My T vertical for 160 is 100 ft vertical and 82 ft horizontal.
> That makes the antenna resonant below the band, with a feedpoint Z of 50
> ohms plus some inductive reactance on 160M. I add series C to tune out the
> L. The same idea will certainly work on 80M.”
>
>   
>
> I believe that this antenna is functioning as a 3/8 wave vertical.  Which is
> nice, but not necessary for good performance.
>
>   
>
> I have a 70 ft high vertical portion with a total hat of about 45 ft (22.5
> ft x 2).  It resonates at 1.84Mhz with 20 Ohm impedance.  It is fed against
> a ground rod and 45 radials – mostly ¼ long.
>
>   
>
> Works quite well.