David wrote:
I purchased these a while ago and pulled them apart to see if there was
much involved in making similar units. They stated 3dB but did not
indicate whether it was dBi or dBd.

No phasing coils anywhere?

What are your recommendations for 915MHz omni-directional antenna ?

I'm not the person to ask. All I would do is access the
web pages of the antenna manufacturers, like Diamond.
--
73, Cecil http://www.qsl.net/w5dxp

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