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Reviews For: Mosley PRO 57-B

Category: Antennas: HF: Yagi, Quad, Rotary dipole, LPDA

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Review Summary For : Mosley PRO 57-B
Reviews: 18MSRP: 1,089.95
Description:
7 el Yagi on a 24' boom
Product is in production
More Info: http://www.mosley-electronics.com
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
00184.7
SM6GFR Rating: 2023-12-10
Never worked Time Owned: 3 to 6 months.
Got this antenna last summer, but sadly never could make it work properly, it resonated low on all bands. 12 and 17 did work nicely after considerable shortening of the elements, but 10/15/20 resonated several 100 kc to low, and was not possible to correct. Several contacts with Mosley, who informed me "something influenced the antenna". Checked all the traps and elements, all correct. Used synthetic guy lines on my versa-tower, no other antennas on the tower, altered the choke, changed the feed-line, but to no avail !
The antenna now lies in my back-yard, and is up for grabs, should anyone want to make a try! I am now going for the "Ultra-beam 6-20", with 4 adjustable/retractable elements, no manual adjustments of elements needed there and no traps.
KC5RR Rating: 2022-08-18
Not as expected Time Owned: 6 to 12 months.
I expected more of this than I got. I replaced a hexbeam with this antenna, and there is just not much improvement in reception. I guess I expected too much.
W9WO Rating: 2015-12-26
Excellent Results on 6 Bands With One Antenna And One Feedline. Time Owned: 3 to 6 months.
I'm happy to say that my Mosley Pro-57-B-40 is now in the air and is getting unsolicited good signal reports. It replaces my 1971 vintage Mosley TA-33 that was still going strong when I took it down. I have the PRO-57-B-40 which is the Pro-57-B with a 40 meter dipole on one of the driven elements which provides for 6 bands of HF coverage, 7 elements on a 24' boom with only one feedline. The SWR on the Pro 57-B-40 is under a 1.7 to 1 on all bands. 10, 12, 15, 17, 20, and 40 meters with just the one antenna. EXCELLENT!!! I was able to get this one used from a fellow near St. Louis MO. It was on the property of a home that he had recently bought and had no use for it. I got it for a really good price off of ebay. Of course it had to be removed and disassembled but it was worth the trip and effort. I could not be happier with the way it is performing and how solidly it is constructed. This one will be in the air for a long time. Very well built!! Assembly is very straight forward with all the elements pre drilled for no measuring or mistakes. All elements are color coded and even their placement on the boom is marked and color coded as well. Bottom line is that if a mistake is made it is almost certainly on you.
Again this antenna is a keeper and I could not imagine ever wanting to replace it. I could see maybe purchasing the Pro-67 conversion kit at some point which would give me 2 elements on 40 meters instead of just the rotatable dipole for that band.
Other than that I think I'm set for life.
You won't be disappointed with the PRO-57-B-40.
73,
Darrell W9WO
K4DZR Rating: 2015-07-08
MOSLEY STRONG! Time Owned: more than 12 months.
I have had it up about two years now. I was sitting under a Palm tree in the Florida Keys when the worst ice storm in 20 years hit Tennessee in Feb. 2015. I "wondered" but did not worry how the PRO-57B was doing. When I returned home I found the Mosley PRO-57B performing and looking exactly like I left it. (But many of my trees did not). This was a really bad storm and required a lot of clean up but nothing to do on the Mosley except get on the air and work some dx hi.

This is a pile up buster with great FB, forward gain and SWR on all 5 bands. A bonus I found, It also has a low swr on 6 mtrs too but not advertised as a 6 meter antenna. I have made several good contacts on 6 mtrs when the band is open.

So if you are looking for a "thing of beauty" that will perform like a champ and last for many years, you might want to consider a PRO-57B by Mosley.

----------------------
Earlier 5-star review posted by K4DZR on 2013-08-23

The Mosley Pro-57b went together according to the instructions and performs per specifications. The SWR is essentially flat on all bands. All parts were there down to the last washer. The color coding made the assembly easy. This is a "big" beam so I assembled it on two metal saw horses where it remained for about 6 weeks before I could get an installer. I used it a 3 feet off the ground with low swr in the mean time and worked about 20 countries. Have it mounted at 48ft on a 45g tower with a tail twister TX2 rotor.
Just got it up today and initial signal reports are excellent. This should be the last beam I will ever need as it is built to last. Good work Mosley!
AK6ZZ Rating: 2014-02-09
Extremely pleased Time Owned: 0 to 3 months.
I picked up a used Mosley Pro 57B that was in great shape for $150 and did some initial A/B testing versus my other Mosley which is the Super 33 on 20m yesterday.

The Pro 57B is preliminarily installed at 25' and I was very impressed. Rated Specs for S33 are 7.3 dbd gain and 25 db F/B versus Pro 57B 8.5 dbd gain and 20 db F/B. I was running 300W and did signal report checks between antennas with a ham friend who lives in Colorado and I am in San Diego.

The S33 is basically at 250' height with help of my tower being on an edge of a canyon (tower at 35' and canyon at 210') and the Pro 57B is at 25' height. Results for initial test were as follows: S9+30 versus S9+25. So for that relatively short install height on 20m the Pro 57B is doing a pretty respectable job. Though antenna height is critical for DXing since lower takeoff angle is extremely helpful. The Pro 57B is on house bracketed rohn tower not permanently installed yet (mast needs to be pushed up) and the rotator installed. Base noise levels are three S units higher on Pro 57B coming from house and neighbor noises. The S33 is pretty far from both house and neighbors. Tower is 50 feet away from house and 2x higher than roof top.

For $150 the Mosley pro 57b was a great deal! I was missing having 15,12&10m and now I have those bands again. I am sure it will be even better when I finish the install and the antenna is at 35'. SWR is perfect even at the low install height on all bands. I was concerned that there would be interaction issues but none so far detected.
WB1CQW Rating: 2013-08-04
INDUSTRIAL STRENGTH YAGI FOR THE WORST WEATHER WEATHER EVENTS Time Owned: more than 12 months.
When I was looking for a HF multi-band beam back in 1993, my primary consideration was durability. I heard that the military would use essentially the same design HF antenna as this with good results. From the reviews of Moseley products I got the impression that they were far ahead of the competition in heft and quality of the aluminum and other materials. Now after 20 years of using a Pro-57B-- the results are in: an excellent antenna!This beam has survived multiple New England ice storms that literally broke apart trees surrounding this house and trashed several successive 40 meter wire antennas attached to them. When a couple of years ago I rewired coax to the Moseley antenna and swapped out its Ham lV rotator, I saw no reason whatever to swap out the Pro-57B. Still in 2013 the SWR readings are quite respectably low. In this location I'm limited by zoning ordinances to 30' height, but this antenna makes the most of the limitations of height and poor worldwide propagation conditions. I suppose I could have replaced this with a far more costly and complicated Steppir antenna, but I don't believe (from 2 way conversations with Stepir stations with the same power level as myself) I would ever gain anything on my signal, while quite likely losing plenty in long-term reliability.
WD4LUR Rating: 2010-12-24
Excellent multiband yagi Time Owned: more than 12 months.
I have had my Mosley PRO-57B for about two years now. I believe it to be the best multi-band yagi I have ever owned. In the past I have had a Hy-gain TH5DX, Mosley TA-33M and a Mosley CL-33M. At one time I had a 10m 3 element monobander and a 15m 4 element monobander up and that was close to one of the sunspot peaks. Even then I didn’t work into Asia as well as I have recently during this sunspot low while using the PRO-57B. I’m not saying the 57B would be better than the 4 element monobander as I attribute some the recent successful contacts into Asia to my location that I am currently at. Both locations were about the same elevation above average terrain but at the new one when I am aiming towards Asia, it is pointing out over what is called Loyston Sea on Norris Lake. Maybe that helps. Anway I don’t know of any single multiband antenna that I would trade this one for except to move up to a Mosley PRO-96 or a monster quad.
K5YY Rating: 2010-05-17
Just a great antenna Time Owned: more than 12 months.
Just wanted to say I have had my 57B for about 13 years, exchanging a 204BA I had for it. Well, there is a compromise on FB and gain figures compared to monoband beams, but the ease of switching bands and the very adequate 2.5KW PEP coils made it a great choice for my subdivision lot and 38 foot Rohn 45 tower. I am not worried about normal modern amplifiers hurting the traps, tho did sell a Henry 4K Ultra and 5K due to fear or exceeding the trap ratings. I had the ice storms also turning the elements into "inverted U" aluminum but they sprang right up with thawing out. Try that with other cheaper, recent vintage beam materials! I have worked anything I can hear with this beam, and as I said, at 38 feet. Very satisfied with this "high potency" alternative to monobanders. Can not put up multiple mono band antennas and 100 foot towers as in past QTHs, so am impressed that I have not missed any DX 'new ones' with this 57B and now have over 300 countries on each band covered, including 10m and 12m.
M0EDX Rating: 2010-05-17
Besta antenna in its class Time Owned: more than 12 months.
I have been looking for a big 5 band beam with real performance.

4 elements stepir was very expensive, so I researched further for the next best antenna.

It turned to be a Mosley Pro-57-B. Just 1 dB difference in gain etc. And no 180 degree mode etc. Well, see above.

I am in the UK. I ordered Pro-57-B, it took about 3 months to have it delivered. It cost me some £100.00 in customs duty, too.

The assembly of the antenna took some time with the friends.

Installation was also fun. Generally you can have it assembled and put up in one day. SWR was close to the advertised.

Have a look at the current photos at my web site www.m0edx.com

Performance. Well, in 2 words - BIG GUN !

Normally if a station is 59 on a distance of 5000+ miles, when you turn the antenna 90 degrees away from the statiion, the signal dissapears completely ! The gain is tremendous.

If compared to A3S, TH3, T8 etc basic yagis, it is nealy twice longer and havier. Hence the gain and real performance. To illustrate - the boom is 7.3 m, weight is about 42 kg. Need I say more ?

If you have space and finances, go for 4 element stepir - it is the antenna of the future. Otherwise mosley Pro-57-B is the best one then.
WZ0O Rating: 2009-10-28
Great soFar Time Owned: 0 to 3 months.
Ok here is the story. I was going to buy a Mosley TA53 when a friend told me about a Pro57 B that was for sale from a SK's wife. I contacted the lady and we made a deal. (no I didn't steal it). Her husband had bought it 4 years ago and had never put it up. After I got it home and put it together I had to wonder if I had made a mistake as the antenna is ,as we say in the south a bigun.
WoW what a great product. First contact I busted a pileup on 17 to Guam then 3 JA's right behind that. This antenna hears very very well.
If you get one follow the setup instructions to a tee. I attempted to use a choke balun instead of the coax balun in the manual. As I live close to the water I was worried about the coax pigtail.
After I went back up the tower and changed the balun the antenna tuned almost flat, much better then stated in the spec sheet.
So-far this is a great antenna. Its big (24' boom) and built like a tank (93 lbs). It should last longer then I do HiHi.
I will give you an update next year.
73
Brad
WZ0O