Why not a Halo!

acepilot wrote:

Any ideas for an omni directional antenna for 144.200 that could be
mounted above the topper of my pickup? Something like a halo/squalo?

Scott
N0EDV

Oops, my fault! I should have elaborated just a bit more. I'm looking
for something to build on the cheap because it will be basically a
one-time use. A halo would be fine if I can build one. I have plans
for something similar from the RSGB VHF/UHF Manual, but it doesn't show
the feedpoint matching detail, so I'm not sure how to match it to 50
Ohms...something made of copper pipe or some 3/16" (I have a source)
steel wire that is copper clad (power pole ground wire) that could
handle 70 MPH.

Scott
N0EDV

Dave Shrader wrote:
Why not a Halo!

acepilot wrote:

Any ideas for an omni directional antenna for 144.200 that could be
mounted above the topper of my pickup? Something like a halo/squalo?

Scott
N0EDV

Scott, N0EDV wrote:
"I have plans for something similar from the RSGB VHF/UHF Manual, but it
doesn`t show the feedpoint matching in detail, so I`m not sure how to
match it to 50 Ohms."

Mine is the 3rd edition with Halo Aerials starting on page 7.29. Make
the shorting bar (A) adjustable in distance from the PL259, instead of
brazed to the brass tubes. Adjust for minimum reflected power in your
50-ohm coax.

Best regards, Richard Harrison, KB5WZI

My book is the 4th edition, so I'm not sure which antenna you have. Is
its circumference listed as lambda/2 or 0.7536 lambda? If it's the one
I suspect (0.7536 lambda) where do you feed it and where does the
shorting bar that you mention go?

Thanks!

Scott
N0EDV

Richard Harrison wrote:
Scott, N0EDV wrote:
"I have plans for something similar from the RSGB VHF/UHF Manual, but it
doesn`t show the feedpoint matching in detail, so I`m not sure how to
match it to 50 Ohms."

Mine is the 3rd edition with Halo Aerials starting on page 7.29. Make
the shorting bar (A) adjustable in distance from the PL259, instead of
brazed to the brass tubes. Adjust for minimum reflected power in your
50-ohm coax.

Best regards, Richard Harrison, KB5WZI