Topband: half size flag antenna--NW6S

[WD8DSB at aol.com]

>> In a message dated 3/9/2010 9:57:57 P.M. Eastern Standard Time,  
kingsburys at bellsouth.net N6WS writes:
 

>>I am interested in building a half size flag antenna (15 ft by 7  ft) to 
work on 80, 40 30, & 20meters.
 
 
 
Hello Jim,
 
I'm a pretty new user of antenna modeling software, but let me take a  
crack at answering your question and lets see how it corresponds to other  
responses you get.
 
I analyzed your desired dimensions using a frequency of 3.5 MHZ.
 
Looks like a termination resistance of approximately 986 ohms is  a good 
starting point, as this is the value that provides  approximately zero 
reactance at the feedpoint and it provides good null off  the back side when 
looking at the elevation plot.
 
You will need a transformer at the feedpoint of the antenna for matching to 
 your feedline, and you will also need a preamp.
 
Lets see what other answers you get to see how far off I am.
 
73's
Don (wd8dsb)