[Elecraft] Antenna suggestions, resent

[Vic, K2VCO]

Here is a diagram of my space (use fixed width font):

            ----------------------------
            |    |               |     |
            |    |               |     |
            |    |               |     |
            |    -----------------     |
            |                          |
            |                          |
            ----------------------------

The small rectangle on top is a small building (10'x20') on top of the 
roof of the 10-story apartment building. Actually, it will be my bedroom 
(and, I think, shack). The larger rectangle is the roof area at my 
disposal. It is about 10' x 30' plus the areas at the side of the 
building. The rest of my apartment is below the roof.

I would love to put a little roof tower on the building with a beam on 
it! But as far as I know, that is not allowed.

I am thinking about verticals, about 3 fiberglass masts holding up a 
shortened 40m dipole, etc.

For 6 and 2 m I have 3 element beams which are small enough that they 
will be allowed.

On 9/28/13 8:01 AM, Edward R Cole wrote:
> Vic,
>
> Too bad you cannot consider a yagi for 20-10m.  That would sit on a mast
> secured to the small roof-top building.  So a  30x 10 foot space?  I
> wonder if the 20x10 foot building extends beyond the 30x20 area?
>
> It it extends so total length is 50-feet  You could put up a doublet
> across the length, either horizontal with 8 foot droop on both ends for
> full length half-wave on 40m or perhaps a pole in the center for
> inverted-V.   Another idea is 50-foot with 8-foot                legs at
> right angles but horizontal at the same height.  Or consider a 120-foot
> horizontal loop if there are places for four support poles.  Being on
> roof of ten stories means the wire does not need to be very high.
>
> An automatic tuner at the roof would finish off any multiband antenna
> with single coax run to shack. To add 6m/2m simple solution is a
> base-loaded 5/8 6m wave vertical (could be a mobile whip).  They load
> fine on 2m as well (trick of VHF mobile stations).
>
> 73, Ed - KL7UW
> ----------------------
> Date: Fri, 27 Sep 2013 21:47:41 -0700
> From: "Vic, K2VCO" <k2vco.vic at gmail.com>
> To: elecraft Reflector <elecraft at mailman.qth.net>
> Subject: [Elecraft] Antenna suggestions, resent
> Message-ID: <52465F6D.9060505 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I just realized that my previous message was sent in html format. Which
> means that the reflector stripped the text! That explains some of the
> answers...
>
> Here is what I meant to ask:
> ----------------------------------------------------------------------
>
> I am moving to an apartment on the top floor of a 10 story building. I
> have access to the roof which has a 30' x 10' flat space. On one edge of
> this space is a building 9' high with a flat roof of about 10' x 20'. I
> can put up antennas on top of this little building and on the flat area
> mentioned above.
>
> But there is a catch: the antenna has to be either a wire antenna, or
> substantially vertical. If vertical, it can't exceed 29' in height above
> the roof of the small building. Beams not allowed!
>
> I want to operate on 40 through 15 meters. The antenna needs to be able
> to handle 1500w.
>
> I prefer horizontal antennas because of the extra gain and lower noise
> pickup. I prefer a balanced antenna because of noise and RFI
> considerations. But I'll consider other options if there are overriding
> advantages.
>
> Suggestions
>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
> dubususa at gmail.com
> "Kits made by KL7UW"
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/