[Antennas] Small space antenna

Sun Aug 30 08:58:08 EDT 2009

Hello Elwyn,
 I have designed a series of "boxkite" yagis that give good performance 
on both 2m and 70cm. These are single-feedpoint designs, and have much 
higher gain, for a short boom, on 70cm than a conventional yagi. For 
example, the 9-element version has a boom length of a fraction over 1m, but 
has a gain on 70cm of 15.7 dBi, which is about the same as that of a 
conventional yagi on a 2.4m boom. Gain on 2m is the same as that of a 
conventional yagi on a 1m boom, at 9.9dBi. SWR is <1.3:1 across the 2m band, 
and is < 1.5:1 from 422 to 439MHz.
 These are not available commercially - yet, but I would be happy to send 
you more details of the performance, plus construction details if you are 
interested.
 73
 Brian KF2YN
----- Original Message ----- 
From: "Elwyn" <M6GKX at Elwyn.org.uk>
To: <antennas at mailman.qth.net>
Sent: Sunday, August 30, 2009 5:32 AM
Subject: [Antennas] Small space antenna
> Hiya Folks
>> I've got a specific requirement for an antenna.
>> I'm in a towerblock, with the balcony being the only place I can put the
> antenna. It is flush with the side of the building and I would be sat
> less than a meter from where it would stand normally, ruling out most
> main choices.
>> I cannot put it lower or higher as other people live in the block too
> and I'm right in the middle. I cannot put it on the roof and run the
> cable down, although that would be nice!
>> A yagi was suggested but I was wondering if there were other choices. I
> have also been informed that I cannot have anything extruding over the
> edge of the balcony but if needs must then I might be able to disguise
> something as long as it's not too big.
>> As for bands, at the moment it is only 70cm and 2m. It may well be
> several years before I reach the HF bands (low finances). I'm UK based
> with Foundation level, so most bands have a 10w limit at the moment.
>> So, what can you suggest or advise I do?
>> Thanks in advance ;)
>> Elwyn M6GKX
> -- 
> Regards, Elwyn
>> Ita erat quando hic adveni.
> VxC2, KM5D at 45k
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