[TowerTalk] Do I need to Offset Yagis 90 Degrees?

[K7LXC at aol.com]

In a message dated 8/25/2011 8:57:04 A.M. Pacific Daylight Time,  
towertalk-request at contesting.com writes:

>  I would rather point them in the same direction. The 2  ele for 40 will 
be 10 feet above the TH-11DX. Anyone have any experience with  this?
 
    Of course we'd all like to have the antennas  pointed the same way. The 
40M 90 degree offset started in the 70's because of  the KLM 4L 40M yagi, 
it seemed to cause destructive interaction unless it was  offset. 
 
    I was surprised to see someone mention that they  had to offset a more 
modern 40M design but anytime you've got yagis in close  proximity, some 
sort of problem is almost inevitable; e.g. destructive  interaction, decreased 
bandwidth, increased SWR, pattern disruption, etc.  

Cheers,
Steve    K7LXC
TOWER TECH