Look up a cobweb antenna, it's a folded dipole design that works quite well. I built one and I really like the performance.
Thanks Don Sent from my iPad On Sep 28, 2013, at 5:01 PM, Edward R Cole <[email protected]> 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" <[email protected]> > To: elecraft Reflector <[email protected]> > Subject: [Elecraft] Antenna suggestions, resent > Message-ID: <[email protected]> > 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 > [email protected] > "Kits made by KL7UW" > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
