Mosley bashing (lynch mob) comes and goes every so often.
Here is a towertalk post from 2006:
I've used a stack of PRO-57*A* antennas for about ten years now. As my
operating skills have developed enough, I've been able to do fairly well in
contests from my home station. The antennas are at 60 and 100 feet, and
have been used to win or place in contests from Tennessee.
I've done pattern and F/B tests with other locals to try to see if I was
seeing any of the "negative gain" that was reported by K7LXC and N0AX on the
PRO-57*B*.
I've done comparisons to stacks of trapped and no-trap tribanders at similar
heights in the Nashville area.
We have consistently found pretty much identical signal strengths into
Europe on 10, 15, and 20 meters. I am on a ridge, but Europe is actually my
worst take-off azimuth, with about a 50 foot rise in the ridge at 45
degrees.
Perhaps something was lost between the 57A and 57B models on the contest
bands? I believe the difference between the A and B models was an additional
trap to provide an extra element for 12 meters? I know that my "A" models
have only two active elements on 12 meters. I truly don't experience any of
the "negative gain" on fifteen meters reported by my old pals Steve and
Ward.
Anyway, mileage always varies. Having operated from a few different places
with different antenna systems, I don't think the PRO57 deserves the bad
rap. I concur with K1AR who said simply, "beams are good." Mine seem to
play quite well, and have lasted over a decade without any problems.
They are built to last. No boom truss is needed. Load up the boom on 40 or
30 meters, and you've got a stout 6-band antenna.
73
-Kirk K4RO
-----Original Message-----
A yagi basically wants to work so it is surprising for one to perform
significantly worse than similar sized antennas. One issue could be
feedline radiation from not using a balun. According to N0AX, the manual
of their test antenna said not to use one.
John KK9A
To: <Towertalk@contesting.com>
Subject: Re: [TowerTalk] Mosley Antenna Question
From: bill steffey <ny9h@comcast.net>
Date: Thu, 19 Feb 2015 10:24:43 -0500
I loved my classic 33....in the 70s.
No too many components to screw up....
Rather than just talking about performance or perceived performance,
let's get some data or anecdotes on WHY these devices perform as such.
So to what do we/you attribute the lack of performance???
traps ??? feed arrangements?? element length/spacing ???\\
bill ny9h/3
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