I have always had good success with full-wave loops for NVIS and I appreciate the low noise characteristics of loops. And since I do more listening than transmitting, they are a natural fit.... A few weeks ago, I was inspired by an article written by WB4DFW for a multi-band, delta loop using home-brew traps. I am now looking to do something similar and build a horizontal, multi-band, 80m long, loop with traps at 60 and 40 meters. My inspiration knows bounds, however, and I am looking to use Unadilla traps in building this antenna. I'm wondering if these traps will work for a loop antenna and will my multi-band retain nice vertical take-off characteristics. I know I can't be the first to try this, but my google-fu is coming up short. I have modeled my past antennas in 4NEC2, but I'm not sure how to model the traps for the current project. My previous modeling has shown - as has others - that the 80m loop will become a great Dx antenna at 40m with a little tuning, but that's not what I'm after. I want to keep natural resonance, or close to it, in the hopes that I'll keep that great vertical, omni-directional, cloud-burning lobe at 60 and 40 meters by putting those traps in!