I recently put up a dipole for 80 and used some RG-6 CATV coax to feed it. Good news is that I cut it for 3550 and the SWR is about 1.3:1 there. Bad news is that it stays pretty much the same all the way up the band. Is the wide bandwildth because the coax is so lossy? It is the double shielded stuff with 2-layers of foil and 1-layer of braid. 73 Tom W7WHY