In article ,
(Ken G.) wrote:

The square pole part is 30 inches long .
The longest `wings` are 30 inches .

I assume the hookups are the wing nuts in the middle of the zig zags .

I wonder about a couple of the details of this antenna, first why are
the reflector elements insulated from the boom? Second and more
interestingly, the placement of the zig-zag elements in front of the
reflector is not symmetrical top to bottom, side to side in the photo, I
wonder what the purpose of this is, if it is to shape the vertical
pattern to somehow maximize the gain when ground reflections are taken
into account?


Regards,

John Byrns

--
Surf my web pages at, http://fmamradios.com/

I wonder about a couple of the details of this antenna, first why are
the reflector elements insulated from the boom?

1) In the Ham world, if the element goes through the boom and is
electrically in contact (shorted) the width of that boom is subtracted from
the total element length when calculating resonance, directors and
reflectors.

2) It may have rotating elements to accommodate shipping and installation.

Those are my guesses.

PP

Neet & purdy

Maybe this will put an ``end`` to this !

Yep .. uh--hu

"Paul P" REMOVE paul @ REMOVE ppinyot . REMOVEcom wrote in message
news:56uii.8076$vG2.5911@trnddc02...
I wonder about a couple of the details of this antenna, first why are
the reflector elements insulated from the boom?

1) In the Ham world, if the element goes through the boom and is
electrically in contact (shorted) the width of that boom is subtracted
from the total element length when calculating resonance, directors and
reflectors.

The way it appears is that the elements are insulated from the boom, and
also broken in the middle, like a dipole would be. If they were active
log elements for the higher VHF channels, I'd expect to see transposing
jumpers interconnecting each set of elements, and also that the elements
lengths would taper... So, those fold up elements make terrible yagi
elements, and they won't work very well as reflectors for the UHF
zig-zag elements. It would be nice to know if that was mounted by
itself on a mast? It looks like a Channel Master design?

Pete

Uncle Peter wrote:
"Paul P" REMOVE paul @ REMOVE ppinyot . REMOVEcom wrote in message
news:56uii.8076$vG2.5911@trnddc02...
I wonder about a couple of the details of this antenna, first why are
the reflector elements insulated from the boom?
1) In the Ham world, if the element goes through the boom and is
electrically in contact (shorted) the width of that boom is subtracted
from the total element length when calculating resonance, directors and
reflectors.

The way it appears is that the elements are insulated from the boom, and
also broken in the middle, like a dipole would be. If they were active
log elements for the higher VHF channels, I'd expect to see transposing
jumpers interconnecting each set of elements, and also that the elements
lengths would taper... So, those fold up elements make terrible yagi
elements, and they won't work very well as reflectors for the UHF
zig-zag elements. It would be nice to know if that was mounted by
itself on a mast? It looks like a Channel Master design?

Pete


Back in the day antenna companies made custom antennas for a specific
area that were combinations for vhf-uhf TV stations. Maybe it's one of
those.