Hi Ken

My first thought would be that a collinear with such a high gain would
have a very narrow vertical beamwidth. ie a small angle off the vertical
where mounted would have the remote site some dB down off the main lobe.
The test for this will be to tilt the antenna back and forth whilst
checking the RSL. Also keep in mind that reflections on 2.4GHz will
cause a similar picket fence effect you might have heard on 2m/70cm.
Your antenna could be mounted in a semi null. (I might try and model
this some day and post you the results)

Next idea is that with such a long colinear you are getting losses along
the coax elements to the point where the upper element is radiating less
than the lower ones. This will cause some skew in the radiation pattern.
(upward tilt) TG213 would have been a better choice for this many
elemets for this reason.

Thirdly... Although RG58 is suppose to have a VF of 0.66 it does vary
some from manufacturer to manufacturer. I havent bothered to work out
how much difference it would make but would suspect that the longer the
antenna (in elements) the worse it would become.

Am thinking of making a Sterba curtain for WiFi. Looks easier than
playing with bits of coax!


Cheers Bob W5/VK2YQA East Texas

Ken Bessler wrote:
I built this antenna expecting better performance from my WiFi
setup.

"Bob Bob" wrote
My first thought would be that a collinear with such a high gain would
have a very narrow vertical beamwidth. ie a small angle off the vertical
where mounted would have the remote site some dB down off the main lobe.
_____________

As a point of reference, commercial UHF broadcast TV transmit antennas can
have elevation gains of 36X or more (~17.7 dBi); still they produce their
predicted signal strengths for their ERP and height above ground over their
line-of-sight coverage areas.

RF