wrote in message
oups.com...
I picked up a Oct 1973 issue of 73 & noticed a interesting article on
a mast mounted rotatible very
hig gain 435mhz antenna, cheap and easy to built. Ive been trying to
build a high gain antenna to
recieve ATV in the 903-928 band & seems this maybe the one. The claims
for
this antenna seem streached abit, they claim 26dB gain from just wire
and a few resistors
and claim its 435mhz design can work up to 890mhz, theres even a quad
rhombic shown
also. Sounds to good to be true, so i wandering if anyone has had any
experience with
actually building & using one of these antennas. I would like to build
some kind of high gain recieve
only antenna to see if its possible to get a decent signal from some
of the ATV repeaters.
Seems here in western N.C. the ATV activity is located mostly in this
located band.
Thx N4aeq

Hi Tucker

I had to re-look at the month that article was published to be sure it
wasnt an April 1 issue.

The antenna's beamwidth, with a circular cross section, will be close to
10 degrees maximum. It is likely that a 12 foot diameter dish would be
the minimum size that would provide that 26 dB Gain at 900 MHz. That gets
pretty difficult to make stable when also rotateable.

I would suggest that you start with a Yagi and try it. You'll soon know
if that gain is adequate. And the money spent on parts wont hurt your
pocketbook. I sure wouldnt expect you to jump into antenna design with a
beginning project of building a 26 dB Gain rotateable antenna.

Jerry