I think you would need Decibels 5 foot (60") off the tower side mount to
make a reasonably true omni pattern out of that.
kc4fwc wrote:
>Hello Group,
>Have a dual antenna system for a 2M repeater. Decibel DB-222 top
>mounted, clears the tower and is oriented for omni-directional
>coverage. TX antenna is directly below and is side mounted on the
>southwest side of the tower. The antenna is a Celwave PD-340-3 with
>dipoles oriented around the mast (omni). It is mounted on the corner
>(not the face) of Rohn 25-G and is a factory mount and top sway brace
>from Decibel Products and they recommend this for side mounting DB-
>224's. The mount lets the antenna extend around 22 inches from the
>leg of the tower.
>
>I am noticing VERY significant deficiencies in TX coverage back
>through the tower, even what I would estimate 8 to 10 dB. In other
>directions, it seems as if the coverage is as good as can be
>predicted.
>
>I have heard someone mention that taking all four dipoles on the same
>side of the mast and directing the elements straight into the tower
>would create more of an omni pattern. I can't remember if this was
>for UHF or VHF. I would like to eliminate any deep nulls, no more
>than 3 dB down in any direction if possible. Will turning all
>elements towards the tower help my situation?
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>Yahoo! Groups Links
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