I believe Phelps Dodge sold that configuration (loops back to back on a support pipe) as a railroad antenna, oriented in the direction of the tracks so they could communicate with trains coming and going. I remember the patterns showing an interesting cardiod in both directions. Compared to a ground plane it would not be omni directional but show gain in at least two large patterns, enough to cover a lot of area and much better than a single loop. the Nixa MO repeater uses 6 side mounted loops fed with a feed harness designed by an engineer at Andrew. Lots of 75 Ohm cable required for such an arrangement. Andrew makes 75 Ohm foam cable for this but the connectors are very hard to find. W6 MTF
--- In [email protected], "Wayne" <wa5...@...> wrote: > > Has anyone had any experience with DB-212 low band type loop antennas mounted > back to back at the same elevation on a mast or tower? What type of pattern > did they have? How did they compare with a ground plane? Would it be better > to use one loop instead of two at the same elevation? If the loops can be > separated what is the minimum for 52MHz? > > Wayne, WA5LUY >
