80M Dipole

I've found an image on the web for an 80M Dipole which is approx 30' end to end. It uses a coil in the middle of the elements on both ends and looks to me like the 20M yagi I built. So I'm wondering if I could use the same logic of the 20M 2 element and make this an 80M 2 element? Of course the boom would have to be a lot longer inbetween the elements, but if I can figure that out (material wise), I bet this could be turned into an 80M 2 element yagi.