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Thread: Need a small footprint antenna

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  1. #1

    Default I need a small footprint antenna

    I need to find a multi band antenna 40-10 meter 80 would be nice but not a must. The thing is I don't have room for ground radials or guide wires. I moved in to a duplex so my yard in small only 6x7. The good thing is the only restrictions my landlord gave me was no holes on the roof or building So it can be big and ugly I know it's like looking for the holy grail but something has to be out there.
    Last edited by KI6VDC; 09-29-2010 at 04:12 AM.

  2. #2

    Default

    I put together one of these,
    http://www.eham.net/articles/20717
    So far I've just been listening with it, and it's been working ok for what it is.

    Daren KE7UQI

  3. #3
    Join Date
    May 2002
    Location
    Rockport, TX
    Posts
    984

    Default How about a real antenna instead of a glorified dummy load?

    Have you considered a hex beam or multi-band Moxon? Or what about a Butternut or small vertical?

    There are lots of choices for us hams with limited space and in my mind, it's hard to beat a hex or Moxon (both are about 70% of the dipole width but actually perform as well/better than a two element Yagi at the same height).

    You can feed either with one 50 ohm feedline and work 5 or 6 bands with few drawbacks. DIY for a lot less than commercial versions, too.

    Something to think about, eh?

  4. #4
    Join Date
    Oct 2004
    Location
    EM16xd
    Posts
    7,426

    Default

    6 x 7 ..hmm Sounds like you need to go "up"

    That is as in vertical.

    I suppose if doesn't have radials, just do your best you can and let the soil do the work in terms of whatever extent that might be.
    73 de Charles - KC8VWM

    North American QRP CW Club #3159, SKCC# 5752


  5. #5
    Join Date
    Apr 2003
    Location
    Maryland
    Posts
    3,445

    Default

    6 x 7. That is plenty of room for a 72 foot crank-up tower with a tribander and 2 element 40 meter yagi. Is this what you were also thinking?

    If you can NOT put down radials you are screwed. But I suspect you COULD put down radials as long as nobody knows they are there, right? So bury them in a slit in the sod.

    paul

  6. #6
    Join Date
    Jul 2009
    Location
    Hurricane, WV
    Posts
    192

    Default

    Gap, MFJ, and Cushcraft make no radials needed verticals and can be mounted most anywhere.

  7. #7
    Join Date
    Apr 2003
    Location
    Maryland
    Posts
    3,445

    Default

    There is no such thing as a "no radials needed" vertical. I guess it depends what you mean by "need". My 66 foot tall 80 M vertical does not "need" radials, but it DOES need them to work well.

    Some sort of radial/counterpoise is needed. I think on of these is a vertical dipole, very short, very inefficient. Just bury the damned radials in the lawn, 4 of them would be a decent start.

    paul

  8. #8

    Default

    Quote Originally Posted by K3STX View Post
    6 x 7.

    If you can NOT put down radials you are screwed. But I suspect you COULD put down radials as long as nobody knows they are there, right? So bury them in a slit in the sod.

    paul
    I could out radials but they would be short given I only have 6ftx7ft lawn. I have a 5btv I might try. but was looking at the AV-640 look like it does not need radials.

  9. #9

    Default

    Quote Originally Posted by K3STX View Post
    6 x 7. That is plenty of room for a 72 foot crank-up tower with a tribander and 2 element 40 meter yagi. Is this what you were also thinking?
    That's actually way more room than you need. I can put a 72' extendable, self-supporting tower on a 3.5' square foundation -- and have. It goes "down" six feet (concrete) and "up" 85 feet (tower + mast). No guys, no radials.

    If big and ugly are acceptable, this requires no holes in the roof and definitely less space than 6 x 7 feet.

  10. #10

    Default

    BTW, this antenna actually works quite well; I've used it, and I just worked somebody last night on the air using one -- his signal was fairly competitive with others in his area using full sized dipoles and such:

    http://www.texasantennas.com/index.p...=99&Itemid=111

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