[TowerTalk] Why is a reflector preferred over director for 2 element designs?

[Jim Lux]

On 8/25/11 8:35 AM, John Harper wrote:
> Most 2-element Yagis and quads use a reflector as the 2nd element. I'm wondering what (if any) advantages a reflector has over a director as the parasitic element for 2-element Yagi/quad designs.
>
> T

It's easier to form a deep null in the direction of the undriven element 
and get good F/B than it is to get a main lobe with more gain.  For the 
vast majority of ham applications, you're really more worried about 
suppressing stuff in the wrong direction than enhancing stuff in the 
right direction (since SNR is mostly determined by atmospheric noise, 
gain doesn't buy you much)