William Phinizy: The VSWR of your half wave vertical is NOT the 1.l, 1.4, etc. that you
state. That's just the VSWR that your K-2's tuner resolves to. Put an SWR
meter between the rig and the antenna and see what that reads.
Moreover, your half-wave vertical is only a half on approximatey 14 Mhz. On
40m, it's a quarter wave and would need some counterpoise to be effective.
But it seems to perform comparably to the OCF dipole..and that' s probably
because of its low take-off angle.
Indrid Cold: There are a lot of people criticising this antenna. They are missing the
point. The point is, this is an effective antenna for those on an extremely
tight budget and have limited space, like myself. All I have is a small rig
I found in the trash and worked a month replacing tiny components to get it
to work on a measly 50 watts pep. The antenna is a J-pole made from small
galvanized conduit. The coaxial cable was also found in the trash. The
power supply is an Xbox 360 power supply with the end cut off. I mount this
garbage antenna on the roof on a metal vent. 10 meters gets good VSWR. Good
VSWR does not always mean good propagation. A dummy load has great VSWR. 10
meters is the only voice HF, I can use with my lowly 25 year old license.
There is little sense in upgrading to general when I can not afford any
equipment and my salvaged radio only has an 18 megahertz to 30 megahertz
range. I am making a home made straight CW key from a mouse trap, cabinet
knob, and old relay contacts. Poverty sucks!
Captain Ron: Thanks guys for the great demo..... I need a portable antenna and that
looks great... 73's K2LOG..
WA2JSG: Nice video, thanks.
1redrubberball: It's apparent that you're happy with your antenna. However, it is not as
efficient as it could be because you don't have a 50 ohm feedpoint Z at the
lower end of the vertical. Your coax cable has several db of loss because
the feedpoint Z of the antenna is very high, over 1000 ohms, possibly 2-5K,
on 20 M. Antenna tuner in the rig only satisfies the rig. Put an auto tuner
at the vertical and ditch the balun.
Steve Weiss: That reminds me. I made one of these end fed antennas a few weeks ago and
forgot all about it. Guess I am going to have to test it out!
SpaceCityBeats: I was under the impression that an FCC Amateur Radio License will supersede
any HOA restrictions against antennas. Search youTube, I saw the News clip
GoodPhotographDotCom: Great video....just bought the same antenna from the folks in Hawaii...was
not considering a vertical approach but am now as a result of the video. I
am curious how you attached the box to the mast? Wire ties? Also, loved the
idea of the umbrella stand for the mast! Thanks!
SpaceCityBeats: Thanks just saw the end of video with purchase info. Thanks for the info!
SirLobsterman: would like to see it's performance in a horizontal set up, tree to tree.
realistic demonstration to what a QRP hiker or camper might do on a
mountain or even at a shore of a large lake or ocean, ect. .
also, the 9:1 unun plans are easily found through google for free, like
SpaceCityBeats: Where did you get the pole?
stanscoyote: It is an Elecraft K2 transceiver.
stanscoyote: I prefer ferrite beads. An 8 turn coax choke affected my SWR negatively.
Paul Linnell: I just bought the 9:1 with 31' of wire for $ 44.00 shipped on E-Bay. I have
a couple of 31' extendable fiberglass poles so I'm ready to let'r rip.
Thanks for the inspiration and information regarding the antenna. I also
operate qrp and am awaiting the arrival of my KX3.
Barry Clayton: I made this antenna with a 10m fish pole and an 9.1 Balun I have worked USA
on 10 15 12 also 40 and 80m, i said to my ham teacher should i be able to
do this ? he said if you kicking out RF Ya hihi Barry 2E0PEC 73 QTH Halifax
Kk Andretti: Thanks Stan..:) enjoyed the video also.:)
Raymond Burns: What about radials De ray wb2mly
kenwood8029: Really informative. I've been experimenting with there here lately and am
beginning to like what I see and hear. Good job.
stanscoyote: An end fed antenna has a very high feedpoint impedance which translates
into a very low ground return requirement. You should read up on the
subject (the Web has lots of good info as do the various ARRL handbooks).
The shield on the coax feedline is providing enough of a "counterpoise" in
my setup. If you feel better, cut a 1/4 wave piece of wire for the band or
bands of interest and toss in on the ground. I'll bet you won't notice any
difference. I didn't ;-)
Crobular I: Surely it needs a 9-1 UN UN toroid transformer though. 2.5" toroid and 18
bi-filar turns should do it.
aka572: Thanks for the video Stan but it only tells me how well the antenna
receives signals. Now I would like to know how well others can hear your
station. Maybe another video? Tnx agn es 73
stanscoyote: I am not familiar with the Ultimax 100. As far as the toroid power, it's
good for 100 watts. Antenna is supposed to work in horizontal and sloping
configuration, as well as inverted "L", but I've never tried it and am
would not be equipped to measure differences in performance anyway. I use
it purely as a "tiny footprint, no radial, easy-up-easy-down" vertical for
portable and home 'stealth' use. Thanks and 73, Stan.
Seymour Lindt: Awesome...ZS1CPT
pasqual dijkstra: i really like this radio, where can i buy it ?
stanscoyote: Thanks for your comment, Barry, and glad to hear of your success. These
EFHWAs certainly deserve their rightful place among our many antenna
options. They are efficient, effective, inexpensive, and able to be cobbled
together by just about anyone. 73 es gud DX.
stanscoyote: Patrick ON4CDJ - Thank you for your comments. The short answer to your
questions is that the antenna is very effective on 40 meters through 10
meters even though it is only resonant on 20. That's why it needs some
method of tuning - either an antenna tuner, coupler, or at the least a
parallel adjustable tuned circuit. I use my internal tuners. Recent QSOs
examples: TF3CW on 30; RO9O,5T0JC, ZD8ZZ, TU2T, on 17; 5N7M on 12; ON4UN,
RK3ER on 10. All 5 watts or less; Worst RST 539 (ON4UN).
Zach Bender: looks like you were on 24.89, thats right at the band edege - your signal
could have splattered outside the band. Good practice is to move up a bit
on said band so you don't risk it.
1903A3shooter: I dont see the excitement here. A piece of wire with a 9to1 transformer.
Your tuner in the transmitter is giving the low SWR reading not that wire.
A end fed half wave can be a good antenna no doubt but it can not resonate
on a bunch of bands like that.
dback4430: Thanks so much . Finally a " direct answer " I am a new ham , have yet to
make my first qso . Been playing with all sorts of antennas since i am in a
second floor apt , The situation is grim. This may prove to be the best
solution for me . I will just operate portable :) I have read so much on
the subject that it all os a blurr . Thanks again David
stanscoyote: Does not need radials. Halfwave antennas have very high feedpoint
impedances with correspondingly low current return requirements. The coax
outer shield does the job in this setup. That's the appeal of half
wavelength wires. Read up on it; worthwhile learning about them.
stanscoyote: I bought two large plastic spring clips from Staples meant to hold thick
sheafs of paper. Then, for each clip, I just cut a length of small diameter
bungee cord, knotted it, slipped it over the mast (from the bottom) and
adjusted the spacing to what I felt was a good working "wrap size". 73, Stan
steveinkentucky: Oops...make that 10/20/40m...
steveinkentucky: I didn't make my end fed antenna, but I have 2 Par EndFedz--a full length
20m model, and the 10/30/40 QRP Mark II model. I love the performance,
solid construction and amazing customer service that LnR Precision gives
you. While Dale Parfitt no longer owns that section of his company (Par
Electronics), Dale is always willing to discuss them and give advice. But,
making some sounds like a good investment also.
N8ZU: Hey gr8 shoot out. I would have had a coax choke on the half wave. 73 de
n8zu good luck and good dxing
MrXSpeaks: Thanks for this video. I now have a setup like this that I use portable
WX9DX: LOL:) Any antenna is better than no antenna:) But your compairison was way
off base. Have Fun. 73 Jimmy, ARRL TC, WX9DX
m0ggk: Hi stan,
stanscoyote: I believe it can make some difference but I never experimented with it. The
tuner resolves any differences. I typically use around 25 feet and it's
just cheap 52 ohm cable from Radio Shack. 73
Audio Fidelity: Thank you for the reply sir! 73, Dave
Peri Cosseboom: I have a 33 foot end fed wire with a Hawaii end fed match box. Very nice
from 10 to 40. Particularity on 10. The guys with the big beams and 1000
watts are clueless and jealous.
stanscoyote: I guess you did not read *all* the comments and answers here, my friend -
of course it is resonant *only* at a single half wave frequency where it's
efficiency is maximized, but it's *also* darn good at *all* frequencies
that are higher than halfwave. It's all about available options when we
can't have the "perfect solution". High SWR antennas actually work quite
well when properly "managed" - for example, the L.B. Cebik-style 44'
multiband doublet that is non resonant in *any* ham band. 73.
2e0bax: There is always a way to get on any band in any building, view it as a
challenge. I have enjoyed many portable activations as well as pedestrian
mobile. CW rocks, I'm not very good at it, but its so much more efficient.
As for antenna experimentation google my call sign....73 de M0GIA
TMFOK7: Hey guys... Great little video! I being an apartment dweller now know
exactly what I am going to do for an HF antenna! Thanks and best 73,,,,K7TMF
reddog694uk: This is very similar to the ultimax 100 antenna but a homebrew version,
yes? Nice job, would like to see how it performs in horizontal and sloping
configuration, also, what kind of power is the toroid rated at? Great vid
!! Mark M3STF U.K
stanscoyote: Dear ADI YO2LIW - no, an end fed half wave antenna does not require
radials. It requires only the simplest return such as a very short
counterpoise (as short as one meter, a simple ground rod, or even a big
piece of metal (like a fence or an air conditioning unit). My vertical in
this video is just using the coax shield. The reference material noted at
the end of the video provides much more information. Of course it's
understood that improving the ground beneath ANY antenna improves perf.
stanscoyote: Oh Gosh, don't give up. There are all kinds of solutions for those of us
living with antenna restrictions. I've earned QRP DXCC and QRP WAC with
indoor antennas and five watts. Just makes it more fun. The secret: CW and
perseverance. Welcome to Ham Radio. Keep reading but start experimenting.
Sooner or later it will begin to make sense. 73, Stan
sealsster: Great Video! Just waiting for my fiberglass pole to be delivered. If it
arrives in time will be trying it on the Virginia QSO party this weekend.
Kk Andretti: Hi, I'm looking for an Antenna that would be good for all Bands, i'm just a
DX'er, and just bought me a new Shortwave Radio to play with ... Is this
actually an Antenna or just a telescoping Pole..? Thanks ... KK
John Wojciechowski: I have the same UNUN from EARC in Hawaii. I bought 2 of them and keeping
one as a backup. Great little matching unit. I live in a townhouse with a
wooden deck and I run the endfed wire under the deck railing. Nobody's the
wiser. Thanks for video.
Patrick Verkimpe: Hi Stan, and thank you once again for this very informative video. What I'm
wondering....it's a halfwave for the 20m band, so it's resonant and also
having a 1.1 SWR, as seen in the video. But how effective is this antenna
on the other bands, where it is not a halfwave ? We saw pretty decent SWR's
on the other bands, but that doesn't tell much about effectivity. Did you
make some on-air tests on, for example, the 30m band ? 72, 73 ! Patrick,