Topband: Shielded Loop

[Gedking at aol.com]

I do not have room for beverages so I use a shielded loop 6' in Dia.with a  
DX Engineering Preamp
it seems to have a lot lower noise level than my inverted L. I was  
wondering if I should Ground the coax at the loop end? 
I also want to make a tuned preamp, for it but can't find the  (broadcast) 
diodes for it. 
Anybody have any experience with shielded loops?
 
G ED King  K8OT
 
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