Base Long wire antenna for cb?

[BJ radionut]

Marconi: Most generally the nulls and lobes occur when operating the antenna on other bands. EX.: 40 meter tuned Inverted "L" will show a completely different radiation pattern when operated on 20/15/10 meters.
Use the 160-meter antenna then model it for operation on other bands and watch how the pattern changes.
My "Phased" Dipole array (W8JK/Lazy H variant) is cut for 80 meters, but when using on other bands will certainly show a much different radiation pattern on say 20 meters.
Just my thoughts. I am not confirming or denying M0GVZ statements.
I just know from that one antenna I use, from personal experience that there are some lobes on other bands that can experience some gain and nulls also when operated on different bands.
All the Best
Gary

I would be interested to see this modeled. The antenna is 125 feet wide (62.5 ft each side) with 34 ft. spacing with an average height above ground 40 ft.
The antenna is resonant 200 Ohms/ X=0 at 3.865 MHZ, then fed with 300 Ohm feedline tuned with a PALSTAR BT1500A balanced line tuner.
Be interesting to see the radiation pattern say on 40/20/17 meters.
The antenna is oriented broadside East/West.

 

[Marconi]

Try modelling them. In my case the antenna was an 85ft long inverted L being used on 20m band and it performed with lobes and nulls exactly as the modelling software illustrated. Modelling it for the 10m band showed even more lobes and nulls.

I can't confirm M0GVZ's results either, but I wanted to see the model he referred to. I just looked up what the ARRL AHB had to say about an Inverted L antenna setup, and I posted it only as an example. Had the article not shown the modeling patterns and the antenna details it did...I would not have posted to this thread at all.

Since there was a claim for some modeling that demonstrated how the M0GVZ antenna worked in the situation sited...I would simply like to see it.

I'm a CB'er from Missouri - "So Show Me"

 

[Tweetybird]

Mine is 180' long hooked only to a Lafayette he 80 reciever.picks up better than the starduster. Its center fed into two 90' wires with a 45' ladder line spaced 4" apart

 

[Tweetybird]

Wife is having a cow about wire across the yard. I guess I can buy a regular antenna for 10 to 80 meters. She gets coal for Christmas.what recommendations anyone has that is straight up and down even a beam would be ok.

 

[Tweetybird]

I can coil the wire antenna and give it to her

 

[Tweetybird]

In a box all wrapped up real nice.

 

[Tweetybird]

Can I I
Loop the ladder feed line and use it?

 

[Tweetybird]

Like a cushcraft mx6b multiband beam

 

[M0GVZ]

Since there was a claim for some modeling that demonstrated how the M0GVZ antenna worked in the situation sited...I would simply like to see it.

I'm a CB'er from Missouri - "So Show Me"

Read L.E.Cebik's article "Straightening the inverted L."

If I can find my EZNEC models I'll put them online for you.

Now I'm more awake the 20dBs were nulls, not gain. Gain is typically 6-10dB in some of the lobes.

 

[Marconi]

Read L.E.Cebik's article "Straightening the inverted L."

If I can find my EZNEC models I'll put them online for you.

Now I'm more awake the 20dBs were nulls, not gain. Gain is typically 6-10dB in some of the lobes.

Conor, thanks for the update.

Here is a link to Cebik's 26 page article.

L.E.Cebik's article "Straightening the inverted L

Here is a link to what you posted earlier about 20db gain.

Long wire antenna for cb?

 

[Marconi]

Gary

I would be interested to see this modeled. The antenna is 125 feet wide (62.5 ft each side) with 34 ft. spacing with an average height above ground 40 ft.
The antenna is resonant 200 Ohms/ X=0 at 3.865 MHZ, then fed with 300 Ohm feedline tuned with a PALSTAR BT1500A balanced line tuner.
Be interesting to see the radiation pattern say on 40/20/17 meters.
The antenna is oriented broadside East/West.

Gary, I doubt I could successfully model this antenna idea. I have no idea how to model a balanced feed line using Eznec, and I think that is probably essential to the idea. I would also think there are plenty Amateur members in the Amateur Section...that can make antenna models and show you some real results.

There appears to be plenty of Hams on the Internet and on YouTube, in particular, that could possibly help with your modeling idea as well.

 

[Tweetybird]

I put it back up.

 

[Robert Buttle]

Anybody use this? And how is performance?

I have a loop sky wire ant. we use it portable.I made it two waves long at 11m.We feed it with 50 ohm coax and a 4 to1 balun it is a good ant. and not noisy on receive. Needs no coupler on some of the ham bands to 40m. And is dead flat on 11m we've been using it on tent poles about eight feet off the ground, the antenna is in a triangle shape and fed near one corner, hope this is useful.

 

[Slowmover]

Wife is having a cow about wire across the yard. I guess I can buy a regular antenna for 10 to 80 meters. She gets coal for Christmas.what recommendations anyone has that is straight up and down even a beam would be ok.

Well, if she won’t give milk any more, it’s a good thing she’s ready to calve.

(Waiting to load trailer. Thx for thread to all)

.

 

[WECSOG]

The easy way to make a random, longish wire antenna work on 11M:
1. Connect coax from the radio to the feedpoint of the antenna, center conductor of the coax to the antenna wire.
2. Connect the braid of the coax to a piece of wire about 109 inches long.
3. Run the main antenna wire as high as possible and as straight as possible. If the wire is more than 30-40 feet long, try to run it in a direction generally towards where you want the signal to go.
4. Check swr. Trim the main wire an inch or so at a time until you get the swr where you want it. When you reach a point that is an odd multiple of quarter waves, the swr will drop.

Some kind of balun at the feedpoint would be a good idea.
I have a theory that I haven't proven (yet) that multiples of a half wave in the feedline (taking velocity factor into account) will help prevent feedline radiation by presenting a high impedance on the outside of the braid.
Like I said, not proven. Just something that occurred to me.