If you want to get better omni coverage, you'll need to attach the dipoles to a mast and use stand-off brackets to hold it away from the tower. The pattern will still be affected by the tower, but not as drastically.
Chuck WB2EDV ----- Original Message ----- From: "MCH" <[email protected]> To: <[email protected]> Sent: Sunday, August 09, 2009 7:33 PM Subject: Re: [Repeater-Builder] 2M Vertical Dipoles > Lots of comments on the unidirectional pattern which I suggested might > not work well. > > Any comments on having the elements on one side of the tower right on > the leg? > > Joe M. > > [email protected] 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 >> >> >> >> ------------------------------------ >> >> >> >> Yahoo! Groups Links >> >> >> >> > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
