version of the Inverted L Multi-Band 10-80m Antenna
Fence Wire- I prefer electric fence wire for all my latest
antenna experiments. It has worked
well for QPR camping, outings, and emergency preparedness, as well as fixed base antennas. I keep a 50
meter roll on a bolt with a
rechargeable drill to retrieve the antenna wire, and a cheap fishing
pole, 10lb line with 1oz sinkers, in
my camping bag. This is all I've ever needed to throw a long wire up in the trees. In this inverted
L, limited space was what was driving
me, so I used every inch of wire I could fit.
I'm using an
ICOM 730 & LDG Z-100 auto-tuner,
so I didn't get too concerned about measuring. I just got it up as high as I could, at as steep
and angle as possible & hoped for
the best. The results were satisfying.
It is important to
use battery grease or similar
compound when connecting copper to aluminum or grounding the feed point. I used spray electric
tape over all exposed connections.
My home has a complete metal outer shell, a new metal roof,
and aluminum siding which is buried
at the base about 5-6 on average. I believe I'm well grounded.
The total length
of the antenna is about 100 ft. 70 feet to the bend, then
about 30' down at an angle to the pole extension. These
dimensions were used to add the maximum length of wire and
stay within my property lines. With the 70Ft straight wire
alone, I could get 80m, but not 40. I shortened cautiously,
then I got 40m, but lost 80m. When I added the vertical
section, I got 80-10m and my little autotuner will tune it all
at full band widths.
So far this is a very quiet
antenna and I'm receiving better reports than the carolina windom I
had previously. It is very well grounded! Net controls on 40
& 80m tell me it's the best signal I've had yet & with
a small lot, that's important to me.
Guanella Balun- http://www.n0ss.net/qrp_4-1_guanella-type_balun.pdf
This balun was simple
to build and works as written. I ran Heliax from my rig to the feed point, which is at the left of the
picture, above my metal roof about 5
feet mounted on a used golf course flag pole. One end is run a short
distance to the metal roof, the other
end extends the full length of my home & shed to a 35 ft mast with a 5 ft fiberglass extension, then
drops about 30 ft to about 7 ft off
the ground mounted to a horizontal PVC extension from the
shed keeping the wire away from the
metal building. I have a pulley at the tip of the pole, polynylon rope, an insulator and can easily
lower the antenna when needed or
stormy weather. With the wire laying on a metal roof, lighting strikes are of minor concern.
Any questions or suggestions please email
rick at my
After much on the air
It performed marginally on 75M and not
very impressive on the higher bands, so I removed the balun at the
feed point, threaded an SO-239 into my metal roof and feed it
directly to the wire from there, leaving the flag pole in place to
give elevation off the roof for a few feet.
The metal roof can now act more like a
ground plane. I ran the transmitter to a manual home-brew roller
inductor tuner, and the bi-pass switch goes thru the auto tuner. It
auto tunes nicely on the higher bands with improved performance. I
bi-passed the auto-tuner and use the manual for 75m with improved
performance. If the connection at the SO-239 holds up it should work
well for some time.