[TowerTalk] stacking monobanders

[Al Williams]

EZNEC DISAGREES??
It seems that most often an assumption is made that "effectively" for 
antenna height refers to dx propagation.  My modeling of a 3 element 40m 
Yagi shows that the maximum gain of the antenna is within a db for heights 
between 70' to 130' and falls off only ~3 db when lowered to around 45'. 
However the elevation angle of the maximum gain lobe does benefit dx 
propagation as the height is increased.

This lowering of the elevation angle is of "effectively" benefit for dx but 
instead may be detrimental, depending on the distance desired--e.g. 
Sweepstakes contesting.
k7puc


> ----- Original Message ----- 
> From: <donovanf at starpower.net>
> To: <towertalk at contesting.com>
> Sent: Monday, November 27, 2006 4:24 PM
>>
>> 60 feet is too low for a 40 meter Yagi to perform effectively.
>>>> W3LPL
>>
>> ---- Original message ----
>>>Date: Mon, 27 Nov 2006 14:57:48 -0500
>>>From: ny6dx at aim.com
>>>
>>> am putting up 2 towers with 2 bay stacks for 10 15 20 and 40 wonder the 
>>> best way to do this. Am thinking of 20 and 15 on the 89ft tower and 2 10 
>>> m anttens and a 2 el 40 on the 60ft. any advice?