[Antennas] Antenna Suggestions

[George, W5YR]

I feed my loop in the center of the base of the triangle with ladderline
taken off a right angles to the wire and parallel to the ground at the 10
ft level.

I modeled the antenna with EZNEC and tried several different positions for
the feed and the best overall for me was the center of the base.

Feeding the apex was the worst in terms of pattern and gain, plus requiring
a much longer feedline.

I strongly suggest modelling your antenna before doing all the work. The
demo EZNEC program you can download will do this antenna easily and give
you an education to boot!

This is a unique antenna that seems to have the gain of a dipole relative
to isotropic, but without the lobed pattern, on 20 meters and above.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437


"Dan Evans, N9RLA" wrote:
> 
> Funny how these things happen, but I've been planning to put up an antenna
> very similar to the "tilted triangular loop" you fellas have been
> discussing.
> 
> Basically, I have 3 trees for supports.  The tallest would put the apex of
> the triangle at about 60'.  The two smaller trees would hold up the wire at
> around 30-35'.  Two sides of the triangle would be around 80' long, and
> slope up from 30-35' high to the 60' apex.  The low side would be around 40'
> long, and pretty much flat at the 30-35' height.
> 
> The problem.  I figure the best place to feed this beast is at the apex.
> But to do this I would have to bring the ladder line down from the 60' level
> to about 8 or 10' high, then run the ladder line parallel to the antenna for
> about 30' to the shack.  I've been told running ladder line parallel to an
> antenna is not a good thing.
> 
> Alternatively, I could feed it in the middle of one of the 80' sides and
> bring the ladder line straight down about 40' to the shack.
> 
> What do you guys think?
> 
> Right now I've been using an 88' dipole about 35' at the center and sloping
> down to about 15-20' at the ends.  It seems to do a pretty darn good job for
> such a low antenna:-)