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Reviews For: Diamond SG-7500NMO (Super Gainer series)

Category: Antennas: VHF/UHF+ Omnidirectional: verticals, mobile, etc

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Review Summary For : Diamond SG-7500NMO (Super Gainer series)
Reviews: 22MSRP: 79.95
2m/70cm NMO-mount mobile antenna
Product is in production
More Info: http://
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
N5XJT Rating: 2019-11-02
Great Antenna! Time Owned: 3 to 6 months.
Using with a NMO mag mount and a 35 watt dual band mobile. Great performance, range is awesome. No problems to date, very happy with this one.
VE3XYD Rating: 2019-11-02
Folding issues from vibrations Time Owned: 0 to 3 months.
For the money I paid for this high-end antenna, the self folding issue from the vibration is ridiculous! Stay away from this model it has a design flaw...
KD9IAQ Rating: 2017-08-09
Recommended Time Owned: 0 to 3 months.
Highly recommended, very low reflected power with 1/4 w 70cm and 1/2 w 2 meter.
KG7OOM Rating: 2016-09-27
I love this antenna Time Owned: 0 to 3 months.
I am able to be hit repeaters with no problems as far as 55 miles.

Easy to install with NMO mount. Just make sure to check all screws for tightness.

I get awesome coverage with this antenna.
VE2DC Rating: 2016-04-18
26 years and still working great! Time Owned: more than 12 months.
Original review: I put one of these on my new Miata many years ago (1990). The antenna outlasted the car which I had for 13 years. A little steel wool and a little grease in the hinge and it's ready to be mounted on my new Miata.
Update: Installed it on my "new" Miata (MX5) in 2006. Still going strong after 26 years (23 in service) with just an occasional cleanup and lubrication of the fold-over joint and a bit of anti-seize compound in the threads. Still using the original Diamond mount too.
VE7REN Rating: 2016-02-21
excellent...#1 Time Owned: more than 12 months.
I own 3 of these antennas.. the first one I bought 4 years ago for my truck. I use a dualband and this antenna performs better than my Larsen ever did.. it has a foldover at the base,that mechanically strong ans easy to fold by pulling up on the antenna. the whip is larger diameter than most antenna,so no bending as much.. the reception is excellent.. I cannot find anything bad...nothing about this antenna,and ive had at least 5 other brands over the years,and the DIAMOND beats them all... if you want a well built dualband antenna for mobile,or low profile at the home{which I have on the deck} this IS the antenna to purchase
KY4TS Rating: 2014-08-14
Very good antenna Time Owned: more than 12 months.
Good sturdy antenna. Performs as advertised. I bought this to fit on an NMO mount that was already installed on a new vehicle. If you have the $$$, this antenna is hard to beat.
W3DBB Rating: 2014-02-09
Good 70cm performance Time Owned: more than 12 months.
I give the SG-7500NMO a 4 out of 5 rating because of its so-so performance at 2 meters as compared with its great performance at 70 centimeters. This area is some distance from most 2 meter repeaters so would have preferred more than a single half-wave for 2 meters, but the specifications for the Diamond luggage rack mount K515NMO I am using advise against using an antenna taller than 45".

To be fair and to provide a bit of a disclaimer for my own remarks, I am using the SG-7500NMO with a Yaesu FTM-350R dual bander. The Yaesu doesn't have the greatest receiver for 2m FM voice. The design of the FTM-350R may have been optimized for APRS. Its too-fast AGC, not so quiet receiver, undersized audio output amplifier, and high-pitched piercing transmit audio lead me to this conclusion. This rig has a beautiful display but when it comes to functionality the Kenwood models beat it hands down.

In the past I have used the Comet SBB-7NMO and the Lakeview 5/8 wave mag-mount for 2 meters, albeit with Icom IC-2100H's which are better receivers than the FTM-350R, with better results. If you live in a populous area you might not notice the mediocre performance of the half-wave at 2 meters.

There are no 70cm repeaters in this area but when I'm on the road the 70cm performance from this antenna is stellar. The two 5/8 wave elements at 70cm do a great job.

The SG-7500NMO is well-made. I would describe it as rugged. I like the foldover feature- very handy. The included cable assembly is also well-made but seems to have been designed for user-convenience as much as for an efficient transmission line. It consists of 13.5' of RG-316 coaxial cable which as I understand it is thin like RG-174 but constructed of teflon dielectric and a PVC outer jacket. This included cable is terminated with a standard NMO-female at one end and a SMA-male at the other. Diamond also includes a SMA to PL-259 adapter so everything is ready to go. I'm not enamored of the thin coax or the adaptor with its attendant impedance bump, particularly as a feedline for a 50 Watt VHF-UHF transmitter.

I might realize a bit better 2 meter receiver performance by removing the cable assembly & adapter and running a standard NMO to about 17' of RG-58 terminated in a PL-259 between the SG-7500NMO and the FTM-350R.

N2QGV Rating: 2014-02-09
Long term...... Time Owned: more than 12 months.
I was visiting the Orlando area in 1992 and my Larson antenna took a dump. Went to AES and bought the SG7500. I moved to Florida a year later, and the antenna has been mounted on a vehicle ever since. So the antenna is 22 years old now, on the back of a Jeep Wrangler, and is working just fine.
VA3MLV Rating: 2013-10-06
2nd review Time Owned: more than 12 months.
Well it's been mounted as a trunk mounted dual bander on my mobile for about a year or so and it performs really well with a FT 7800R transceiver , even though its pretty directional due to where it's mounted. It would probably work a bit better mounted on a magnet mount on the roof of the vehicle but its still works really well as a trunk mount. I point my vehicle in the direction to where I need with all directivity in that direction so the vehicle acts as one big directional GP.;