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360 ft. wire antenna 22db gain?

Discussion in 'Amateur Radio Antennas' started by linearone, May 1, 2009.

  1. linearone King of NY

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    I remember reading on some internet site about some end fed wire antenna that was around 360 ft. long and it showed 22db gain. Some hamster's site.
    Does this ring a bell with anybody? Id really like top find it again.


     
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  2. SR385 Active Member

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    Sure it might be possible at many full wavelengths long at a given frequency and terminated at the end.

    I would be highly directional and narrow in the direction of the far end of the wire though.

    I believe Cebik covered end fed wires. That's the site you want for wire antenna info.
     
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  3. Wire Weasel Senior Moment

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    Yeah that might be possible but it still sounds pretty high. Longwires of this kind are also called Beverage Antennas and would need to be in a straight line and will be directional straight off the end. Guys who live out in the plains on a big piece of flat land will have several of these and switch around to obtain TX in the different directions.
     
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  4. mackmobile43 Jock Supporter

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    How about 2 of them 90* out of phase? or stacked?(y)
     
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  5. Captain Kilowatt Professional Amateur Staff Member

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    360 feet and 22 dB gain?? Maybe on 2m but NWIH on any HF band. My 600 foot antenna only had about 9 dB gain on 20m and that was directly inline with the antenna wire.
     
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  6. W5LZ Crotchety Old Bastard

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    While it's possible, it's also very frequency dependent, as already posted. The part that's typically left out, the frequency/shape/circumstances is the 'kicker'. Might be possible on '440, but not on 160 meters. If you should happen to find that site, it'd be interesting to read it. - 'Doc
     
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  7. C2 Well-Known Member

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    I think that is what I read, 10 wavelengths long gives about 10 dB gain straight off the end...
     
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  8. linearone King of NY

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    it was a while ago, I still cant find the site. I really wish i could even remember what band it was for. I guess from what you guys are saying is its not possible on 27mhz so I guess i will have to just put it out of my mind...lol
    it really sounded like something when I read it
     
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  9. Moleculo Administrator Staff Member

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    QRN, Are you sure you measured the length of your wire properly? I didn't know Canucks knew how to measure in feet :love:
     
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  10. Captain Kilowatt Professional Amateur Staff Member

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    Hey come on now. We are bilingual didn't you know that? (y) Actually i grew up with the standard system and learned metric in middle school so it's real easy. Measuring in Smoots however takes a bit getting used too. :D
     
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  11. Beetle Well-Known Member

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    1 furlong = 118.21 Smoots. (Thank you, Google!) :confused:
     
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  12. Savoir Faire Member

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    It is possible

    However, you will use 450 ohm antenna and a 4:1 balun and a radio with an Antenna Tuner or a Linked Coupler tuner. I know it will have much gain but again very directional and not a lot of usage.

    Do as someone else suggested in the posts. Read L.B. Cebiks years of research at Introduction

    Check out the DOUBLET instead at cebik.com. It will not have quite as much gain but it is high gain if you make it 140 feet or even 280 feet if you have enough yard or trees. Again you will need ladder line a 4 to 1 balun and an antenna tuner

    Best wishes,


    Savoir Faire is everywhere (Wheeeeeeee)
     
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  13. N5GE Member

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    That's not possible.

    According to an EZNEC 5.0+ Pro model I just made the gain at ten feet above the ground on 14MHz is 8.5 dBi. At 200 feet it's 11.1 dBi.
     
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  14. N5GE Member

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    What you described is a Beverage antenna. They actually have little gain and are not used for transmitting. They do however have a sharp frontal lobe at the terminated end. They are very low noise antennas and are usually used with a preamp.

    They have to be several wavelengths long to be effective.

    Amateur Radio Operator N5GE
     
    Last edited: Mar 22, 2011
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  15. Beetle Well-Known Member

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    You don't transmit with a Beverage antenna; they're for receiving only. (Well, okay, you COULD transmit with one, but not well at all. Make the worms nice and toasty, though.)
     
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