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
