On Mon, 17 Apr 2006 18:08:39 -0500, "Hi" no@spam wrote:
Thanks for the response. Any sort of waveguide based antenna that will work
as vertical omni?

Hi Matt,

You are bucking the dominant waveguide mode with the design you've
found. Turning the slots will kill it. Just turn the design you've
found sideways.

The alternative is you choose a larger waveguide and introduce iris
apertures inside the waveguide to force a mode that would allow turned
slots. This is all in presumption that you want a vertically oriented
fixture (taller than wide) to give you vertically polarized signals.

Other options include horns and truncated parabolic reflectors - or
something as simple as a 90 degree sweep with a small flared opening
for matching. This would no longer make it omni though.

73's
Richard Clark, KB7QHC