20m END FED HALF-WAVE PORTABLE Ham Radio "DX" Antenna

[NG9D]

• Hi Sam, Thanks. A LW antenna is long enough to generate gain. A half-wave (λ/2) wire has a pattern with two radiation lobes broadside, a 1λ wire has a four lobe “cloverleaf” pattern and a 2λ wire makes eight radiation lobes. When longer than 2λ, the lobes in direction of the wire get stronger. Gain in lobes comes at the expense of attenuation in the nulls. LW that are end fed tend to have stronger lobes in the direction of the wire. If fed at the TX, RF is a concern except at QRP. 73 Lynn/NG9D

[MrErectorset]

do you measure the 10.4 meter wire from the back of the tuner or the portion that is outside the window?

[GregS635563]

Nice set up. I used the original version of that tuner back in the late-1970's with a Tempo-1 and @ 90 feet of wire up 25 feet. The set up worked, except on 20. It was bacause of the length of the wire, but I could make 90 feet fit in a straight line. And the Tempo was 200 watts on 15, 40, 75/80 with that set up. My prize cards from those days are a ZL (on 15 SB), some VKs (on 15 SB/CW) and an HK on San Andreas Island (on 75). GL & 73

[franziski71]

The success of this antenna is its very high impedance so efficiency is close to 100%

[CraigShawZL1WZJJ0LYY]

Really great NG9D, transmitting on a shoe-string!! Like the end fed. Just encouragement I need to get up on morse, thanks for the ideas & inspiration. ...hope to see you on air from Shigakogen mountains soon. 73 JJ0LYY Craig

[on4mgy]

Nice video, great to hear some CW at easy wpm rate.

Antenna seems to work fine.

Thanks for the posting

73 de ON4MGY Nic

[uslines]

Thanks for posting your video. I was very interested in your antenna set-up. Nice having a half-wave wire, which usually means no counterpoise necessary. That antenna can save many an antenna restricted ham from the QRT blues.

Again, congrats

N2UGB

[zosinternational]

i have the same tuner so the antenne start in the shackk what kind of swr meter do you use and do have earth it

[NG9D]

@zosinternational Hi, thanks for the question. With the IC703 I just use the internal SWR meter. No grounding needed.

With my Ten-Tec T1300, I use a Ten-Tec T1202 SWR meter.

73, Lynn NG9D . .

[meterbands]

thanks again for the information. I have all the parts to build one in my junkbox I think io will try it out over the weekend.

thanks again and 73.

Paul M3XPR.

[meterbands]

great video

I have an MFJ16010 and its a nice little tuner.

Your antenna looks great for portable or stealth installations.

Do you use a ground system with this antenna? I know its not so critial in an end feed 1/2 wave.

73 Paul M3XPR.

[NG9D]

Hi Paul, On that set up, just the 10.4m wire, no counterpoise. Oh, that little extra bit of wire near the table is just a short piece taped to the antenna and tied to the table leg. That way the antenna won't pull the banana plug out of the socket. I could have used nylon cord instead.

73 Lynn NG9D . .

[Shortwave68]

Very good video thanks and five stars from me best greetings from germany!!