1. Product Overview
The Radtel Tri-Band Flex Antenna RHD-771S is a versatile and durable antenna designed to enhance communication for a wide range of two-way radios. Its flexible design and broad frequency coverage make it an ideal accessory for various communication needs.

Figure 1: Radtel Tri-Band Flex Antenna RHD-771S, showcasing its sleek design and length.
2. Key Features
- Tri-Band Frequency Coverage: Operates across 136-174 MHz, 200-260 MHz, and 400-520 MHz, providing extensive communication capabilities.
- Flexible Design: Constructed from a flexible material, allowing for easy storage and portability without damage.
- SMA Female Connector: Equipped with a standard SMA Female connector for wide compatibility with various radio models.
- Enhanced Signal Performance: Designed to improve signal reception and transmission for clearer and more reliable communication.
- Durable Construction: Built to withstand outdoor conditions and regular use.

Figure 2: Illustration of the Radtel Tri-Band Antenna's frequency coverage (136-174MHz, 200-260MHz, 400-520MHz) and high gain capabilities.

Figure 3: The flexible design of the soft whip antenna, demonstrating its ability to bend for easy storage and transport without compromising integrity.
3. Compatibility
The Radtel Tri-Band Flex Antenna is designed for broad compatibility with most two-way radio models on the market that feature an SMA Male connector. This includes, but is not limited to, the following brands and models:
- Baofeng/Pofung: BF-666S, BF-777S, BF-888S, UV5R, UV5RA, UV-5RB, UV-5RC, UV-5RD, UV-6, UV-8, 5RE plus, BF-F8+, UV-B6, UV-B5, BF-K5, BF-A5, BF-A58, UV-A52, UV-82, UV-9R, UV9R Plus, etc.
- Radtel: RT-910B, RT-470X, RT-920, RT-730, RT-4D, RT-860, RT-880, RT-880G, RT-490, RT-890, RT-470L, RT-830, RT-850, RT-470, RT-590, RT-600, RT-630, RT-330, etc.
- Kenwood: TK-360, TK-370, TK-370G, TK-372, TK-372G, TK-3100, TK-3140, TK-3160, TK-3170, TK-3180, TK-3200, TK-3202, TK-3207, etc.
- RETEVIS: H-777, RT-B6, 888s Plus, RT5, RT6, RT7, RT21, RT23, RT25, etc.
- HYT: TC-268, TC-268S, TC-368, TC-368S, TC-370S, TC-500, TC-500S.
- LINTON: LT-3288, LT-6288, LT-3188, LT-2188, LT-3260, LT-3268, LT-6188, etc.
- PUXING: PX-777, PX-777Plus, PX-666, PX-888, PX-888K, etc.
- QUANSHENG: TG-K4AT, TG-K100, TG-K200, TG-K58Mini, TG-6A, TG-5A, TG-620, TG-5A Plus, TG-K4AT(UV), TG-360, etc.
- VHF: MR HH125, HH350, HH350W, HH450, HH500, HH600, etc.

Figure 4: Close-up view of the SMA Female connector on the antenna, designed for wide compatibility with various radio models.

Figure 5: Example of a compatible radio, the Radtel RT-470X, which benefits from the antenna's enhanced reception capabilities.
4. Setup and Installation
Installing the Radtel Tri-Band Flex Antenna is a straightforward process. Ensure your radio is powered off before proceeding.
- Identify Connector: Locate the antenna connector on your two-way radio. It should be an SMA Male connector to be compatible with this antenna.
- Align Antenna: Carefully align the SMA Female connector of the Radtel antenna with the SMA Male connector on your radio.
- Screw On: Gently screw the antenna onto the radio's connector in a clockwise direction until it is finger-tight. Do not overtighten, as this can damage both the antenna and the radio's connector.
- Verify Connection: Ensure the antenna is securely attached and there is no wobble.
Once installed, the antenna is ready for use. You may power on your radio and proceed with normal operation.
5. Operating Guidelines
The Radtel Tri-Band Flex Antenna is designed to optimize your radio's performance across its supported frequency bands. Follow these guidelines for optimal operation:
- Frequency Selection: Ensure your radio is tuned to the appropriate frequency within the antenna's supported ranges (136-174 MHz, 200-260 MHz, 400-520 MHz) for the best performance.
- Antenna Positioning: For maximum signal strength, try to keep the antenna as vertical as possible during transmission and reception.
- Environmental Factors: Performance may vary based on terrain, obstacles, and atmospheric conditions. Using the antenna in open outdoor environments will generally yield better results.
- Avoid Obstructions: Keep the antenna clear of large metal objects or other obstructions that could interfere with signal propagation.

Figure 6: An individual operating a radio with the Radtel antenna in an outdoor setting, demonstrating typical usage for enhanced range and clarity.

Figure 7: Various usage scenarios for the Radtel antenna, highlighting its versatility in different professional and recreational environments, such as industrial sites and outdoor adventures.
6. Maintenance and Care
To ensure the longevity and optimal performance of your Radtel Tri-Band Flex Antenna, follow these maintenance tips:
- Cleaning: Wipe the antenna with a soft, damp cloth to remove dust and dirt. Avoid using harsh chemicals or abrasive cleaners.
- Storage: When not in use, store the antenna in a cool, dry place away from direct sunlight and extreme temperatures. Its flexible design allows for compact storage.
- Inspection: Periodically inspect the antenna for any signs of wear, such as cracks in the flexible material or damage to the connector.
- Connector Care: Keep the SMA Female connector clean and free of debris to ensure a good electrical connection with your radio.

Figure 8: The Radtel antenna stored in its protective packaging, illustrating proper storage to maintain its condition and prevent damage.
7. Troubleshooting
If you experience issues with your Radtel Tri-Band Flex Antenna, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Poor Signal Reception/Transmission | Incorrect frequency, loose connection, environmental interference, damaged antenna. |
|
| Antenna Does Not Fit Radio | Incompatible connector type. |
|
8. Specifications
| Attribute | Detail |
|---|---|
| Model Number | Tri-Band Antenna 144/220/435 (RHD-771S) |
| Frequency Range | 136-174 MHz, 200-260 MHz, 400-520 MHz |
| Connector Type | SMA Female |
| Antenna Length | 35 cm / 13.7 inches |
| Item Weight | 1.44 ounces |
| Product Dimensions | 2.17 x 4.07 x 2.17 inches (packaging/base) |
| Manufacturer | Xiamen Radtel Electronics Co.,Ltd |
9. Warranty and Support
Specific warranty information for the Radtel Tri-Band Flex Antenna RHD-771S is not provided in the available product details. For warranty claims, technical support, or further inquiries, please contact Radtel customer service directly through their official website or the retailer from whom the product was purchased.
You can visit the official Radtel store for more information: Radtel Store on Amazon.





