Topband: 160 delta used on 80

[Robert Harmon]

I have been looking at the radiation pattern for a 160 delta loop fed for vertical polarization with the base wire 12 feet above the ground.
I was wondering what the radiation pattern would be for feeding the 160 loop on 80 meters.  Can't find published radiation patterns for 
a 2 wavelength delta which I guess this would be when using it on 80 meters.  Can anyone steer me in the right direction ?  

tnx
Bob
K6UJ