Diamond X300A Dual-Band Base/Repeater Antenna 144–148 MHz & 435–450 MHz High-Gain Vertical Base Station VHF/UHF Antenna with UHF Female Connector and Fiberglass Radome

Features

• High-performance dual-band base and repeater antenna engineered for 2 meter (144148 MHz) and 70 centimeter (435450 MHz) amateur radio operation, delivering strong transmit and receive signal performance across both bands
• Achieves elevated gain of approximately 6.5 dBi on 2 m and up to 9.0 dBi on 70 cm for expanded range and clearer communication on local nets, repeater links, and fixed station setups without complex tuning
• Constructed with a rugged fiberglass radome and corrosion-resistant hardware designed for long-term outdoor deployment on towers, masts, rooftops, or permanent installations in varied weather conditions
• Factory pre-tuned design with broad frequency coverage and VSWR typically below 1.5:1 ensures efficient RF transfer, simplified installation, and reliable performance right out of the box
• Standard UHF female (SO-239) connector allows easy integration with existing low-loss coax feed lines and mounting hardware, making this antenna an excellent choice for amateur radio, club stations, emergency comms, and repeater systems
• High-gain dual-band vertical antenna covering 144148 MHz (2 m) and 435450 MHz (70 cm) without field tuning
• Approximately 6.5 dBi gain on 2 m and 9.0 dBi gain on 70 cm for enhanced RF performance
• Durable fiberglass radome and corrosion-resistant hardware for extended outdoor reliability
• Factory pre-tuned with stable VSWR performance across both operational bands
• Standard UHF female (SO-239) connector for broad coax and mount compatibility

Description

The Diamond X300A Dual-Band Base/Repeater Antenna is a premium-grade vertical antenna designed for amateur radio base stations, repeater sites, and fixed station communications requiring high-gain performance across the 2 meter and 70 centimeter bands. Covering 144–148 MHz and 435–450 MHz, this antenna combines broad frequency coverage with enhanced gain characteristics — approximately 6.5 dBi on the 2 m band and up to 9.0 dBi on the 70 cm band — to provide elevated transmit reach and improved reception sensitivity compared with lower gain alternatives. Built to withstand rugged outdoor environments, the X300A features a sturdy fiberglass radome with overlapping outer shells and corrosion-resistant stainless-steel hardware. The robust mechanical design delivers excellent wind resistance (up to about 112 mph without ice) and long- lasting structural integrity in varied weather conditions. A factory-pre-tuned structure with optimized C-Load and linear phase shifter technology enables broad band performance and low VSWR without the need for field adjustments, simplifying setup on rooftops, towers, or permanent masts. This antenna accepts standard mast diameters (about 30–62 mm) and terminates in a UHF female (SO-239) connector that seamlessly integrates with low-loss coax feed lines for typical VHF/UHF installations. Its DC-grounded design and rugged water-proof joint couplings ensure stable performance in wet or corrosive environments. The X300A’s combination of high gain, durable construction, and easy integration makes it an excellent choice for amateur radio operators, repeater builders, public safety networks, and club installations seeking dependable dual-band base station performance.

Antenna: DualBand Base / Repeater Antenna

Brand: Diamond Antenna

Color: White

Impedance: 50 Ohms

Maximum Range: 184 Feet

UPC:

Manufacturer: Diamond Antenna

Number of Items: 1

Item Package Dimensions L x W x H: ‎63.5 x 4.9 x 1.5 inches

Package Weight: ‎1.29 Kilograms

Item Dimensions LxWxH: ‎65 x 4 x 4 inches

Brand Name: ‎Diamond Antenna

Country of Origin: ‎Japan

Warranty Description: ‎1 YEAR

Color: ‎White

Number of Items: ‎1

Manufacturer: ‎Diamond Antenna

Part Number: ‎X300A

Date First Available: January 13, 2015