[Antennas] Quiet horizontal loop?

[ARDUJENSKI at aol.com]

In reading articles and comments regarding horizontal loop antennas  
frequently the comment about being QUIET antenna pops up. There was never a  followup 
of why it is quiet. Looking at the typical lobe patterns it appears  that one 
reason might be the fact there is generally there is a large null  vertically. 
In many cases local noise is high angle with exception of storms  over the 
horizon.
 
I would suspect the fact that the lack of static buildup on the antenna  
could play a role in some small way but not as significant as the former.
 
I would appreciate some clarification. (By the way I do realize the  
relationship of cut frequency and operating frequency and height above ground  for the 
horizontal loop affects the lobe pattern)
 
Thank you
Alan KB7MBI
Woodinville, WA