I am getting ready to put up a 6 meter yagi (5 el on 12' boom) and a HF antenna (15 meter yagi on 18' boom or force 12 C3E) atop my 54' tower. anybody have experience with stacking this combination or something similar? my first thought is to put the 6 meter yagi about 2' above tower top and HF antenna 4' above that. suggestions? jim N1NK