[TowerTalk] Two 15M yagi stacking

Stan Stockton k5go at cox.net
Sat Feb 24 12:55:13 EST 2007

K1TTT wrote: 
 >With 5 or 6 elements from here you can not 
cover all of Europe without rotating them. 
W4ZV wrote:

         I strongly disagree.  My 6 element KLM array 
has a 3 dB beamwidth of about 54 degrees, which 
is plenty for Europe.

I guess when people talk about 3 dB beamwidth it is just a measure of reference, so I will use it as well.  Let's say you could double the boomlength and realize about 3 dB more of gain than the original antenna.  Now if you want to compare the two antennas look at what the 6 dB beamwidth is of the new antenna.  However many degrees that is will be the place where the two antennas would be equal and everything less than that, the larger antenna will be better!  I don't know how to calculate it but would bet that if W4ZV antennas had 3 dB more of gain that the stack would be approximately as good as what he has even at 27 degrees off in either direction and be better by a VERY significant margin in the direction he had them pointed..

I'll gladly take all the gain I can get pointed right at Germany.

Stan, K5GO

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