What was the spacing between the tower legs at the mounting location of the dipoles in your model? Allan Crites WA9ZZU
-- In [email protected], n...@... wrote: > > At 8/9/2009 05:47, you wrote: > > > >As frequency decreases, so does the importance of keeping the dipoles > >exactly above one another. This is why you can get away with mounting the > >bays of a LB array around a smaller tower (like Rohn 25) and still have > >very good omni-directional performance. Positioning the bays around a > >central supporting mast of a UHF array creates considerable pattern > >distortion and gain is lost. > > I once modeled this arrangement in NEC-Win: the resulting pattern looked > like a warped pancake. On-horizon gain was all over the place. > > Bob NO6B >
