[Antennas] Vertical and parasitic question

[ARDUJENSKI at aol.com]

Merv
Thank you for the feedback. A few years back I started out looking how to  
improve the vertical (at least make it perform better). It appeared that to go  
from 0.5 dBi to 3 dBi you needed to go to 120 1/4 to 1/2 wl (that is a lot of  
work). As you pointed out phasing verticals allowed you to be a little less  
perfect on the radials and can gain 2-3 dBi. But phasing had scared me off 
(not  sure why). While contemplating the phasing I discovered the Inverted 
Bobtail  called the ROBERT'S TAIL in the ANTENNA COMPENDIUM Vol. 2. I figured the 
concept  would work on the Inverted Halfsquare. The plus was NO RADIALS. By 
George it  worked like gang busters with nice low angle lobe and 2 S-unit 
rejection off the  ends. Putting the Inverted Halfsquare on tripods allowed me to make 
this  rotatable. The other nice thing was almost a 50 ohm match. 
 
Well, after all this I want to go back and try these other methods out  of 
curiosity and from a learning perspective. (By the way those looking at  the 
inverted half square I can email you a simple file that shows the  
lobe/swr/dimensions. Note the antenna analyzers really are of little value is  setting this 
up. I got the dimension several years ago from Mr. CEBIK. These  dimensions 
were later confirmed as near optimal on EZNEC). 
 
I hope to first learn how to set up the parasitic and then go to the  
phasing---THANKS
Alan KB7MBI