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Thread: Question about city antenna install

  1. #11
    Orca Whisperer
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    Quote Originally Posted by WB0LSR View Post
    Very good to know.. I was sort of under the impression that not having the radials spread equidistantly around the antenna would negatively affect the radiation pattern to a large degree.
    If it's in the center of the yard, they would be more or less spread equidistantly :)
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  2. #12
    "Island Bartender" KG4CGC's Avatar
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    Of course the smart assed option would be to bring in a lot of Carolina red clay which is like an antenna mirror due to its high iron content.
    ;)

  3. #13
    Pope Carlo l NQ6U's Avatar
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    Quote Originally Posted by KG4CGC View Post
    Of course the smart assed option would be to bring in a lot of Carolina red clay which is like an antenna mirror due to its high iron content.
    ;)
    Or southern California clay. Different metal (aluminum) but same result.
    All the world’s a stage, but obviously the play is unrehearsed and everybody is ad-libbing his lines. Maybe that’s why it’s hard to tell if we’re living in a tragedy or a farce.

  4. #14
    Tiki Bearer WB0LSR's Avatar
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    Actually, if you go just outside of the STL metro area in any direction you run into red iron-rich clay everywhere you go.. MO is full of iron.

  5. #15
    Whacker Knot WØTKX's Avatar
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    As far as radials are concerned... something to consider is ground screen.

    http://www.sherweng.com/documents/GroundScreen-sm.pdf

    Here's a wild stealth antennas system. Very impressive.

    http://www.ac0c.com/main/page_antenn...nna_array.html
    Last edited by WØTKX; 05-04-2011 at 01:36 PM.
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  6. #16
    Conch Master W2NAP's Avatar
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    another idea. might sound a bit wierd. if the tree is on his property and he can climb. imax at the top of the tree. (alot of cb'ers around here would slap the antron or imax up at the top of a 60ft tree and do pretty well)
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  7. #17
    Tiki Bearer WB0LSR's Avatar
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    Quote Originally Posted by W2IBC View Post
    another idea. might sound a bit wierd. if the tree is on his property and he can climb. imax at the top of the tree. (alot of cb'ers around here would slap the antron or imax up at the top of a 60ft tree and do pretty well)
    That thought had crossed my mind too.. but then I would be relying more on my camo paint job than I'd like. The imax sticking out from the top of the tree will be pretty conspicuous.

  8. #18
    Conch Master W5GA's Avatar
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    Quote Originally Posted by WB0LSR View Post
    Very good to know.. I was sort of under the impression that not having the radials spread equidistantly around the antenna would negatively affect the radiation pattern to a large degree.
    With my 4-BTV, I'm sure it did...but not to enough of a degree that I ever noticed. I ran them in a bow tie because the antenna was only about 15-20' from the house. Another 15-20' on the other side was horse pasture, and I didn't want them tangled in the wire. So, that took care of having any radials running N-S. I put 36 random length radials, all running roughly E-W. They weren't really "random", all were at least 35' long (for 40M), I just didn't bother to measure them. With a ground mount, there is no need to have different radials for different bands. This is NOT true of an elevated vertical. If elevated, you need to have at least a pair of radials per band. You tune them the same way you do a dipole. For a ground mount, what matters is that they be there. Just make them all long enough for the lowest freq. and they'll work great on all bands above that. If you have to bend the radials, zigzig them, horse shoe them etc doesn't seem to matter. It may effect the feed point impedance a bit, but it'll still play - and play well (for a vertical). Don't try to compare its performance to a beam, because it'll really seem sucky by that measure. A good installation will equal or better a 1/2 wave dipole at most elevation angles. Where it really shines is on DX, due to a low radiation angle. For local work, you're better served by a LOW (less than 1/4 wave high) dipole.
    Last edited by W5GA; 05-04-2011 at 03:59 PM.
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  9. #19
    Tiki Bearer WB0LSR's Avatar
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    ^I see.. that makes sense. I don't need a perfect pattern anyway, so I think there is a very good chance I'll be able to make this work!

    Quote Originally Posted by KC2UGV View Post
    If it's in the center of the yard, they would be more or less spread equidistantly :)
    I also considered that, but that removes my concealment. This install has to be very stealthy, otherwise my anal-retentive neighbor to the north will whine and bitch no end and take her case to the HOA. She keeps her nose up everybody's asses around here, much to the dismay of the entire neighborhood. At any rate, concealment is the best option for my sanity.
    Last edited by WB0LSR; 05-04-2011 at 04:17 PM.

  10. #20
    Conch Master W2NAP's Avatar
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    Quote Originally Posted by WB0LSR View Post
    That thought had crossed my mind too.. but then I would be relying more on my camo paint job than I'd like. The imax sticking out from the top of the tree will be pretty conspicuous.
    just paint it od green lol.

    it would be a "wont notice it unless your really looking for it" kinda deal if the tree is tall enough
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