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MFJ-1786 magnetic loop antenna

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Here is the famous MFJ loop antenna in action, available at www.mfjenterprises.com or www.gigaparts.com.

Ideal for the amateur operator who is space restricted or in an HOA community where they cannot have an outdoor antenna. The 1786 model shown covers 30-10mhz continuously and i had multiple strong 5 9 reports. Check out the video for complete setup and operation.

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50 Comments

    Popular Comments:

mykenwood830 . 2018-11-10
doesnt leaving it keyed with a high swr harm the finals? even at 5 watts ??
121 2 . Reply
Marc Hoffman . 2018-10-23
was wondering about the 30 watt reading when you said you were putting 5 watts into it. Maybe I just don't understand the swr meter you're using. I like to use a single needle.
121 2 . Reply
Joe S . 2018-07-20
Good video, thanks for making it. However the instructions say for SWR, not to insert the antenna mount mast more than 2 inches past the mount bracket. I think your's is a good 8 to 12 inches past it
121 2 . Reply
EDWARD BELLUSO . 2018-06-01
excellent video on the loop antenna...you did use i do believe 1 to 5 watts to tune with... which is fine but as soon as one will up the power to lets say 60 watts the swr change's a lot.... your 1 to 1.5 swr will now be around 2 to 1..... still not bad and useable..... i have this mag-loop antenna myself and at 60 watts input the lowest i can get on 20 meters is a 2 to 1.... still not bad for the loop..... my icom 7410 still like's the 2 to 1 swr ... some radio will back off the output with a 2 ro 1 swr.... anyway i like the mag loop antenna its a good way to go....just to be diffferent.... nn6aa
121 2 . Reply
Grey Ghost . 2018-03-18
The Solution for all band coverage if you live on a lot like mine with ZERO Trees.... Is either the cheap option of the MFJ Loop, and a Vertical with a base inductor match for working 160 and 80. Then for 40 through 10 Meters is this :https://www.dxengineering.com/parts/mzz-baby/documentation

The Ciro Loop "Baby" is built like a brick outhouse. Sure. It's $2K, but it's built for Northern Winters with the snow and wind, and the Vertical I have had up for a decade. Base Matching Inductors by MFJ or http://www.ad5x.com/images/Articles/Match43footerRevA.pdf

The Ciro Mazzoni Loop above has an automatic control box that follows your radio's frequency and tunes the radio automatically. There is no fiddling with buttons.

Magnetic Loops are fantastic performers. I have used them for the past 26 years. I just built one myself that is portable. It works 6.700 through 22.000, so 40 through 15 Meters.

For Fun, Search on Google (Images) "Magnetic Loops". It is mind boggling the different designs.

Thanks for the video. When I lived in upstate NY, I ran one of these in my Attic, and broke pileups on phone ALL the time with less than 50 watts. It is absolutely the best antenna for either portable or difficult situations. It's the most power out, and it's really what every ham wants. super low SWR, and Minimal fuss.

This Guy has a great site about Magnetic Loops. There are several Videos.

https://www.youtube.com/user/loughkb/featured

73. KB2QQM
121 2 . Reply
Juli e . 2018-03-14
That helped a lot in setting it up vertically Thank you.
121 2 . Reply
STINKS DeFeces . 2017-11-01
AND NOT ONCE DID YOU IDENTIFY YOUR STATION WHEN YOU WERE QRMING THEORY FREQUENCIES LOOKING FOR YOUR "SWEET SPOT" WITH THIS FLAMING MFJ POS!!!
121 2 . Reply
Grey Ghost . 2017-10-27
I had the AEA Isoloop. I kick myself for selling it way back in 1994. Since then I have built my own loops. they work GREAT !
121 2 . Reply
Jd Martin . 2017-10-21
Has anyone done a test in both the vertical and the horizontal position to see which performed the best? I personally don't see a reason to use it horizontal
other than maybe a space restriction issue.
121 2 . Reply
STEVIE GILLESPIE . 2017-10-01
Almost 2 year's on after this video and with the cycle heading toward the bottom of the cycle, i'll give you my update of the 1786x....I have my loop horizontal on a 20ft pole and a small tv rotator... worked ZS, PY with 95w on 15m, EA9 on 15m with 5w power out, N4LA and AE7KI TODAY 01/10/2017, 95w out..... I'm just a little gobsmacked and delighted with this loop.... way beyond my expectation of what I thought it would do and what it DID do.... VY73 All... good dx de MI0GTA... Stevie
121 2 . Reply
Black Sun . 2017-08-21
ilike
121 2 . Reply
Black Sun . 2017-08-21
ilike
121 2 . Reply
VideosByVick . 2017-08-09
How well does this loop work on 10 meters?
121 2 . Reply
Carl Dennin . 2017-08-01
Eric,
After watching your video, I purchased the MFJ 1788 even though I had some concerns with supposed quality control issues that I had reviewed on some sights. Living in an HOA community I needed something that would do the job at a full 100 watts, be stealthy or be portable. I am so happy I did! This antenna does a surprisingly good job of getting a great signal out. The remote control makes it easy to tune, although there is a learning curve.
I have the loop mounted on a 4' pole using a picnic table umbrella stand in the driveway of my condo.  When I'm done I just bring it back in the garage until the next time I operate. I'm using the Yaesu FT450D in PSK31 mode right now and and even when the band is not so hot (which is most of the time anymore) it still does a great job. Made contact with a Russian station back in June ( R6AV ) which has been my longest contact so far with about 30 Watts. This antenna is a keeper, thanks for the video review! KC8ROA,  Carl
121 2 . Reply
nr3rful . 2017-07-08
after 2 years now, do you still use this antenna?
121 2 . Reply
broadcastmediaLE . 2017-05-23
Hi there! Just want to know if the QRM on Loop antenna is much better than on wire Dipol antenna? I am fighting with 9+ QRM on my QTH in the city - it is so bad! Please share you experiance! Regards from Germany! Jens
121 2 . Reply
Joe Framo . 2017-04-29
Eric thank you for the presentation did a great job on the MFG loop
121 2 . Reply
Douglas Goree . 2017-04-07
I like, I want one. Real nice contacts with it being u in FL. one in MO.
121 2 . Reply
digitalmediafan . 2017-04-02
can it tune with an icom 7300 internal atu ?
121 2 . Reply
Don Nidiffer . 2016-11-22
Hi can this be used for CB radios if so where can I get one
121 2 . Reply
El Kabong . 2016-11-16
The one real advantage to this antenna (to my mind) is that unlike other mag loops, the tuning box allows it to be tuned remotely, without having to run outside and try to tune with noise and then run back and forth until it's tuned. I set mine out on the balcony, using a thin patch cable (Comet CTC-50M) so that I was able to fully shut the sliding door onto it with no loss of power (the flat cable handles up to 100 watts, as the MFJ mag loop does) and I am happy so far.
121 2 . Reply
Edward Van Natta . 2016-10-14
I am looking for details about your product place lave a message. When I post this, I am looking for more information on this
can find this and much it run write back ASAP
121 2 . Reply
Tomato Man . 2016-09-30
Just so you know, 20 meters is not 20Mhz nor is 30 meters equal to 30Mhz. I see a lot of advertising for this antenna saying 10-30 meters and 10-30 Mhz. Which is it?
121 2 . Reply
Gabriel Sierra . 2016-09-01
Can you tune for maximum band noise and then do a fine tune with 5watt? this is how most loops are tuned, to get them in the ballpark and then fine tune
121 2 . Reply
jfranke3 . 2016-07-20
Thanks to this video and Eric's Recommendation I purchase this antenna. I live in a deed restricted neighborhood so I put this in my attic. I couldn't be more pleased. I also used this antenna on Field Day 2016 in my toy hauler trailer. Eric did a video from there and the contacts were amazing. Check out his other video on how to operate on Field Day.
https://www.youtube.com/watch?v=zKXfdBMpytQ
121 2 . Reply
Victor Nelson . 2016-07-03
A capacitor and a 1m metal loop? I would think you could build one with little cost that would operate from say 10meg to 30meg. Just think the price of some ready made equipment is high. Maybe when the word HAM comes into things the price goes up.

I will try this evening to source parts to try and home brew this thing. 20m-10m would do me.
121 2 . Reply
kellypaws . 2016-07-02
Great videos. I've ordered my mag loop. Fingers crossed it does the business too.
121 2 . Reply
Chad Butler . 2016-05-26
actually, the silver aluminum straps go over the gold brackets allowing a flat surface to tighten the bolt to.  Have fun!
121 2 . Reply
Coil Smoke . 2016-05-24
Cool how the amp draw corresponds to proper tuning. Peak tune = highest draw = highest radiated power ?
121 2 . Reply
Dean Galloway . 2016-05-20
Another awesome video, thanks for your time and effort!
121 2 . Reply
cigarjohn42 . 2016-05-12
Also, after tuning a particular band, once it's tune, then that etire band doesn't need to be tuned anymore unless I change bands? And does the unit have any type of a memory when I can just move through the bands without retuning it each time.
121 2 . Reply
cigarjohn42 . 2016-05-12
If I mount this antenna in my attic or outside roof, should it be used with a rotor? Also, if you don't use a rotor like in an attic installation, is there a marking on the antenna to determine which direction I can point it in? Also, can this antenna be used with out that control box. Will my radio's built in antenna tuner tune this antenna?
121 2 . Reply
Bill Dench . 2016-04-03
Hi, Bill from nz, ZL2BILL. I have been watching your video, I have limited space for Aerials so this appears to fit the bill. It's in the mhz range that I'm interested in so please could you tell me the price of this aerial?
121 2 . Reply
Mark Smith . 2016-03-19
What is your noise floor normally where you live with your off center fed dipole? It looked about S1 to S3 with the loop.

Where I live and with my R8 vertical, my noise floor is S5 on a good day, S9 on a bad day. I'm wondering whether the electrical noise rejection of magnetic loop antennas would help my situation, whether it's worth the ~$500 to try. 40m and 80m are where I really have problems though. I'd be ok with an Rx only antenna since my rig has an Rx antenna port and switches automatically to the main antenna for Tx.

73 de KR6ZY
121 2 . Reply
Arnold Alt . 2016-03-16
While tuning what is your transmitting power set at?
121 2 . Reply
Arnold Alt . 2016-03-16
While tuning what is your transmitting power set at?
121 2 . Reply
rob b . 2016-03-06
WHAT A PITA to tune !
121 2 . Reply
George Ace . 2016-02-22
I ended up buying a 1788X that cost $1,300AUD - half of it is shipping fee. Better be good it's cost more than the radio.
121 2 . Reply
Willy Vanlerberghe . 2016-02-08
JohnCan alsoo be used to send ! in case you diddend know !
121 2 . Reply
Scott Gibson . 2016-02-03
I have had QSO's with Australia, New Zealand, Japan, Denmark, and more from CA on my 1786 no problem. These work fine business. de WM7C
121 2 . Reply
George Ace . 2016-01-10
Impossible to get it into my roof. The manhole is to small. Roof will be better for me and better than this 8.6mtr tall vertical. Cant put that on the roof because power lines are to close. I get a poopy reception with it mounted 1' off ground. So looks like one of these might help me out lots.
121 2 . Reply
Paul Fallon . 2015-12-14
Nice video. Think i will start saving to get one,73 de 2i0otw.
121 2 . Reply
VideosByDPF . 2015-12-04
Great comprehensive video!
121 2 . Reply
Al Gallo . 2015-11-23
Eric,
Great video. This is Al, W0ERE. Obviously no one can argue about using a Magnetic loop for transmitting. You did it and you did fantastically well. Congratulations! You sigs were totally readable. You really surprised me with the on air result. Enjoy ham radio!
121 2 . Reply
TexasPrepper86 . 2015-11-20
MFJ --- manufacturing junk
121 2 . Reply
Radio Hobbyist . 2015-11-20
Good vid. I have one too and use it all the time!
121 2 . Reply
John Lord . 2015-11-20
Mag loops great for pulling in weak signals. Of course, they are only meant for receiving. 73 KJ6YYC/Extra/VE/FE
121 2 . Reply