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The

Diamond SG-7900

(often associated with the QYT KT-7900D) is a high-gain, dual-band VHF/UHF mobile antenna designed for 144/430MHz (2m/70cm) operation. It is prized for its high gain—5.0dB (144MHz) and 7.6dB (430MHz)—and its convenient fold-over hinge for low-clearance areas.

Key Technical Specifications

Frequency Range: 144/430 MHz (2m/70cm)
Gain: 5.0 dBi (144 MHz) / 7.6 dBi (430 MHz)
Max Power Rating: 150 Watts
Length: ~1.58 meters (approx. 62 inches)
Weight: ~498g - 600g
Connector: PL-259 (UHF-Male)
VSWR: < 1.5:1

Performance & Features

High Gain Design: The "Super Gainer" (SG) series provides significant gain to increase range compared to smaller antennas, with many users reporting a 30–60 mile reach.
Radialless Structure: The antenna works efficiently on both bands without requiring a large ground plane, making it versatile for mounting on various locations on a vehicle.
Fold-over Feature: Features an articulated joint near the base that allows the antenna to be folded down for entering garages, tunnels, or car washes.
Durability: Constructed of stainless steel for long-term use. However, some users note the center loading coil can be a weak point under heavy stress.

Mounting & Compatibility

Mounting Type: Typically uses a PL-259/NMO connector, requiring a heavy-duty NMO or UHF-female mount, such as the RB46 or RB400.
Compatibility: Designed for 144/430MHz, but commonly used for GMRS and other commercial/amateur UHF frequencies.
Package Options: Often bundled with a mount (e.g., Nagoya RB-400) and 5 meters of RG-58 cable.

SG 7900 Antenna for Car Radio Dual Band VHF UHF144-430MHz ...
The condenser in the middle is very weak. * High-concerned chemicalNone. * Voltage Standing Wave Ratio (VSWR)Higher than 1.5. * Im...
AliExpress
Diamond SG-7900 Dualband Antenna 2m/70cm - WiMo
Technical description SG-7900. The Diamond SG-7900 operates on VHF (2m) and UHF (70 cm). Excellent performance even while driving,
WiMo
Diamond Antenna SG7900A - Reviews - DX Engineering
Diamond Antennna SG7900A. ... This antenna is fantastic. It is mounted on my pickup truck and I now can get all the repeaters in m...
DX Engineering

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Web results

QYT 7900D diamond VHF UHF Qual band antenna

QYT Radios

https://www.qytradio.com › qyt-7900d-diamond-vhf-u...

QYT Radios

https://www.qytradio.com › qyt-7900d-diamond-vhf-u...

QYT 7900D diamond VHF UHF Qual band antenna. Light weight and medium length mobile radio antenna with SL16-J connecter and 146/250/360/430MHz frequency.Read more

diamond 7900d antenna from www.qytradio.com

Mobile Radio Quad Band ANT-7900D Antenna 144/220 ...

Amazon.com

https://www.amazon.com › Mobile-ANT-7900D-Anten...

Amazon.com

https://www.amazon.com › Mobile-ANT-7900D-Anten...

Quad band:the frequency of two way radio antenna is 144/220/350/440MHz with the gain of 3.0/3.5/4.5/5.5dBi,which improves the talk distance,receive and transmit ...Read more

diamond 7900d antenna from www.amazon.com

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Diamond SG7900 "Super Gainer" antenna - Forums

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May 16, 2025 — This one works exactly as advertised. It purportedly has 7.6 dB gain at 430 MHz, so it probably produces a fairly similar result on GMRS frequencies.Read more

Mounting the Diamond® Supergainer SG7900

Reddit · r/amateurradio

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I have a Diamond SG7900 on top of my van, NMO mounted. After a few months it came unscrewed and I almost lost it on a long freeway drive.Read more

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