--- wa9ba <[EMAIL PROTECTED]> wrote:
> We put a DB 224 up after loosing 2 Diamond 510
> antennas and a
> station master to lightning about 5 years ago.
> One of the advantages of a four-bay dipole antenna
> over a fiberglass
> vertical of similar gain is that the vertical
> bandwidth is remarkably
> superior. This makes the dipole antenna work better
> for close-in
> portables and mobiles that are below the main lobe
> of the pattern.
> It's
> also much less prone to wind-induced noise.
>
> 73, Eric Lemmon WB6FLY
According to the specs, most of the fiberglass
antennas and dipole antennas in the 6 dB range have
similiar main lobes, the type of antenna doesn't seem
to affect the lobe, it's more a function of gain. Most
3 DB omni antennas will have about 36 degrees of
vertical lobe; 6 db will be 18, and 9 db will be 9
degrees. Some slight variations to these numbers will
occur, but they'll be close. Dipole arrays are not
always better than fiberglass sticks, they both have
their places, and pros and cons.
Joe
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