The Diamond SG9700 is a high-performance, professional-grade tri-band mobile antenna engineered specifically for demanding radio amateurs who require multi-band operation across the 6-meter (51-52 MHz FM), 2-meter (144 MHz), and 70-centimeter (430 MHz) bands from a single vehicle installation. Manufactured by Diamond Antenna with precision engineering, this heavy-duty mobile whip delivers exceptional signal propagation and high gain, making it an excellent choice for navigating rugged terrain, highway commuting, or establishing long-distance contacts via local and distant repeaters.
Constructed from premium, weather-resistant materials to withstand highway wind resistance and harsh environment exposure, the SG9700 features an intelligent, multi-layered electrical design. Measuring 1.07 meters in length and weighing 340 grams, it balances robust construction with a highly aerodynamic footprint. The antenna functions as a 1/4 wave on the 51 to 52 MHz FM band, a highly efficient 1/2 wave center-loaded (C-Load) radialless element on 144 MHz (yielding 3.0 dBi gain), and a powerful double-stacked 2x 5/8 wave center-loaded radialless array on 430 MHz (yielding an impressive 5.8 dBi gain). Because it utilizes a radialless design on the VHF and UHF bands, it performs at peak efficiency without requiring a massive metallic vehicle ground plane.
Built to interface seamlessly with modern high-power tri-band mobile transceivers, the Diamond SG9700 boasts a maximum power rating of up to 100 Watts FM (total cumulative input). It is precision-matched to a nominal 50-ohm impedance and achieves an exceptionally low voltage standing wave ratio (VSWR) of less than 1.5:1 across its core operational frequencies, ensuring optimal power transfer and safeguarding your radio’s internal power amplifier. The base of the whip is terminated with a standard heavy-duty UHF male connector (M-P / PL-259), making it universally compatible with standard SO-239 mobile mounts, gutter clamps, or heavy-duty trunk lid assemblies.
Key Features
- High-Efficiency Tri-Band Performance: Seamlessly covers the 6m (51-52 MHz FM), 2m (144 MHz), and 70cm (430 MHz) amateur bands.
- VHF/UHF Radialless Architecture: Features a 1/2 wave (144 MHz) and 2x 5/8 wave (430 MHz) C-Load structure that operates at peak efficiency without a ground plane.
- Impressive High-Gain Output: Delivers 3.0 dBi gain on 144 MHz and a powerful 5.8 dBi gain on 430 MHz to push your mobile signals further.
- 100W Power Handling: Safely manages up to 100 Watts of continuous FM RF power, making it fully compatible with high-power mobile rigs.
- Low VSWR Profile: Precision matched to achieve an efficient VSWR of less than 1.5:1 for safe transceiver operation.
- Standard M-P (PL-259) Connection: Solid mechanical base threads natively into standard heavy-duty SO-239 vehicle mobile mounts.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Diamond Antenna |
| Model Designation | SG9700 |
| Product Type | Tri-Band Mobile Whip Antenna |
| Frequency Bands Supported | 6 Meters (51-52 MHz FM) | 2 Meters (144 MHz) | 70 Centimeters (430 MHz) |
| Antenna Element Type | 51-52 MHz: 1/4 Wave 144 MHz: 1/2 Wave C-Load radialless 430 MHz: 2x 5/8 Wave C-Load radialless |
| Antenna Gain Rating | 3.0 dBi (144 MHz) | 5.8 dBi (430 MHz) |
| Maximum Power Input | 100 Watts FM (Total cumulative) |
| Nominal Impedance | 50 Ohms |
| VSWR (Standing Wave Ratio) | Less than 1.5:1 |
| Base Connector Type | M-P (PL-259 / UHF Male) |
| Antenna Length | 1.07 m |
| Net Weight | 340 g |
Package Content
- 1x Diamond SG9700 Tri-Band Mobile Antenna Assembly
- 1x Hex/Allen Tuning Wrench
