In article ,
David wrote:

Hi,

I am looking for recommendation for a design of antenna to operate
in the band 915-928 MHz.

The desired response is omni-directional with gain greater than or equal
to a 1/2 wave dipole, something that does not require a ground plane
and is reasonably straight forward to manufacture in-house.

So far I am considering a 1/2 wave vertical dipole with feed through
lower element, J-Pole and Collinear.

Thanks in advance for any ideas or link to a web site that might have
some homebrew versions I could replicate and try.

While they are into commercial sales, you could look at what Hyperlink
is selling
http://www.hyperlinktech.com/web/antennas_900.php

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