TX915-JK Series is a versatile line of omnidirectional, bendable rubber rod antennas engineered specifically for the 915MHz ISM band. Tailored for LoRa, LoRaWAN, Helium (HNT) networks, and smart home ecosystems, this series offers adjustable articulation (0° to 90° bend), allowing you to orient the antenna perfectly vertical regardless of how your device is mounted.
Available in gain configurations from 2.5 dBi to 3.5 dBi, these antennas provide a robust balance of compact size and signal penetration. With options for direct SMA-J exterior mounting or internally routed IPEX-1 (U.FL) connections, the TX915-JK series delivers reliable, low-VSWR performance for a wide array of sub-GHz wireless terminals and gateways.
Series Specification Comparison
Select the optimal 915MHz variant based on your enclosure design, connector type, and gain requirements:
| Model SKU | Gain (dBi) | Length (mm) | Frequency Range | VSWR | Connector Type |
|---|---|---|---|---|---|
| TX915-JK-11B | 2.5 dBi | 110 mm | 895–935 MHz | ≤ 1.5 | SMA-J |
| TX915-JKS-20 | 3.0 dBi | 195 mm | 895–935 MHz | ≤ 1.5 | SMA-J |
| TX915-JKD-20 | 3.5 dBi | 200 mm | 895–935 MHz | ≤ 2.5 | SMA-J |
| TX915-JKS-IPX20 | 3.0 dBi | 197 mm | 885–935 MHz | ≤ 1.5 | IPEX-1 (U.FL) |
*Note: All models feature 50Ω impedance and a flexible/bendable rubber radome design.
Updated: April 2026
Key Technical Features
① Articulating Base (0°-90° Bend)
The articulated hinge design allows the antenna to be folded at a 90-degree angle or positioned straight. This is crucial for omnidirectional antennas, as they perform best when pointing straight up. Whether your enclosure is mounted flat on a desk or vertically on a wall, you can adjust the antenna for optimal RF radiation.
② Seamless Integration Options
The series supports both external and internal builds. The SMA-J models attach securely to standard gateway bulkheads, while the JKS-IPX20 provides a direct IPEX-1/U.FL connection, eliminating the need for an extra pigtail adapter when connecting straight to an embedded PCB module.
Expert Selection Guide
- Compact Nodes (TX915-JK-11B): At just 110mm, this is ideal for portable LoRa end-nodes, USB dongles, or small sensors where a 200mm antenna would be too cumbersome.
- Maximum Range (TX915-JKD-20 / JKS-20): For gateways or stationary sensors, the ~200mm variants provide higher gain (up to 3.5dBi) for better signal propagation through walls and obstacles.
- Embedded PCB Projects (TX915-JKS-IPX20): Choose this if you are mounting the antenna inside a plastic enclosure and need to plug directly into an SMD LoRa module's U.FL socket.
Ideal Applications
🌐 LoRaWAN Gateways
Indoor packet forwarders and Helium (HNT) hotspot miners requiring adjustable, high-efficiency 915MHz antennas.
🏠 Smart Home Ecosystems
Central hubs and controllers utilizing Sub-GHz protocols for smart lighting, security, and HVAC management.
💻 DIY Maker Projects
Excellent for open-source IoT nodes built with Arduino, ESP32, or Raspberry Pi paired with Ebyte LoRa modules.
🏭 Wireless Telemetry
Industrial sensor networks transmitting small data packets over long distances in factories and warehouses.
Frequently Asked Questions
1. I'm building a LoRaWAN gateway using a Raspberry Pi and a GitHub project (like ChirpStack). Which connector should I choose?
If you are using a Raspberry Pi LoRa HAT (e.g., SX1302), the board usually has a tiny U.FL (IPEX-1) socket. You have two choices: use the TX915-JKS-IPX20 to connect directly to the HAT, or use an SMA-to-IPEX pigtail cable routed to your enclosure's exterior, and then attach one of our SMA-J models to the outside.
2. Why does the bendable feature matter for my Ebyte LoRa module?
Omnidirectional antennas radiate signal outward like a donut. If your device is plugged into a horizontal wall socket, a straight antenna would point horizontally, shooting half its signal into the ceiling and floor. The bendable joint allows you to fold the antenna 90 degrees so it points straight up, ensuring maximum horizontal range for your nodes.
3. What is the difference between the JKS-20 and the JKD-20?
While both are approximately 200mm in length, the JKD-20 offers a slightly higher peak gain of 3.5dBi compared to the JKS-20's 3.0dBi. However, please note the JKD-20 has a slightly wider acceptable VSWR margin (≤2.5 vs ≤1.5). For most standard IoT applications, both will perform excellently, but the JKS-20 offers a tighter tune.