If possible, skip the introduced balun and coaxial losses and run balanced feed-line. That's easy enough... been doing that for years and years at my own station. The reason I said this is to show that the use of such a feed method can be put to efficient use with a balanced antenna -- like the high 80 meter loop I built and used to WIN and set a NEW RECORD in a highly competitive U.S. contest -- Sweepstakes. Example: a 1/3 wavelength high loop presents an impedance peak, in relation to "ground," at around 165 ohms or so. The 4:1 balun transformation and coax use method does work -- and work well -- if the antenna's design and it's environment present a matching impedance. You've have to know what you're up against... ahead of time. I work that way. Yet, generalized assumptions can be made, and a case developed around them for such certain "multi-band" antennas -- as in your case. Merry Christmas!