Jim, et al:
I've been 'recommending' to hams that they should, if possible, buy a
Yagi of computer aided design. Roger Cox did this at Hy-gain and I
believe his are the oldest computer-aided design Yagis. Most Yagi
manufacturers don't have anyone on staff that can help with
engineering-level questions. One ham that I know of bought a multi-band
Yagi that was way off spec for SWR, basically unuseable. Many hours,
lots of $$$ on tower climbing and so on didn't resolve the problem. The
ham finally took a big loss and bought an antenna from a different company.
The 'new' generation of antenna designers that have been prolific with
excellent designs (N6BT, etc) are long in the tooth. Are there any new
guys coming along?
73
-de John NI0K
On 3/30/2026 10:15 PM, Jim Brown via TowerTalk wrote:
> On 3/30/2026 6:30 PM, Doug Renwick via TowerTalk wrote:
>> Nothing scientific
>
> That's exactly why you don't notice differences -- band conditions
> easily obscure the differences. The difference in gain, averaged over
> each band, between the large Moseley and Force 12 tribanders was 5-6
> dB. 6 dB is an S-unit, corresponding to 4X the transmitter power.
>
> BTW -- it is not "bashing" to do well controlled measurements and
> publish the result.
>
> The report on these tests is "HF Tribander Performance, Test Methods &
> Results, 2nd Edition" by Ward Silver, N0AX and Steve Morris, K7LXC."
> It was published in 1999 by Champion Radio Products. There's also a
> report on a later test of HF multiband verticals. Each costs $20. Ward
> retired from ARRL a few years ago, where he was responsible for
> updates to The Handbook, The Antenna Book, and authoring other books,
> including the ARRL Book on "Grounding and Bonding." I worked with him
> for about 15 years on all three books. Ward is a VERY smart engineer.
>
> https://championradio.com/product-category/publications/
>
> N6BT has published several editions of his very useful book about
> antennas and their design called "Array Of Light." I have either the
> 2nd or 3rd edition (currently loaned out to a new ham, so can't look
> at it). It is written for those who are not engineers, but this
> engineer learned a lot from it.
>
> The current edition is the 4th, and a description on his website says
> it's focused on HF verticals, which is has been his small company's
> focus for a decade or so. For the discussion of HF Yagis, you want the
> earlier edition.
>
> This is the newer book. https://n6bt.com/on-line-check-out-cart
>
> 73, Jim K9YC
>
>
>
>
>
>
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