1. Introduction
The KING Extend Pro LTE/Cell Signal Booster is designed to enhance cellular voice and data coverage for all U.S. cellular carriers. This device is suitable for use in RVs, trucks, travel trailers, ice houses, and horse trailers, providing improved signal strength for multiple users and various cellular devices. It supports 5G Ready, 4G, and 3G LTE voice and data, functioning both while parked and in motion.
2. Package Contents
Verify that all components are present in your package:
- KING Extend Pro Booster Unit
- Outdoor Antenna with Coaxial Cable
- Indoor Antenna with Coaxial Cable
- AC/DC Power Supply
- Roof, Pole, and Ladder Mounting Brackets

Image 2.1: KING Extend Pro Booster Unit and Outdoor Antenna. This image displays the main booster unit with its distinctive orange fins and the white cylindrical outdoor antenna.
3. Safety Information
Observe the following safety precautions:
- Do not operate the booster near water or in excessively humid environments.
- Ensure proper ventilation around the booster unit to prevent overheating.
- Use only the provided AC/DC power supply.
- Keep antennas away from high-voltage power lines and other electrical hazards.
- Maintain a minimum separation distance between the outdoor and indoor antennas to prevent oscillation.
4. Installation Guide
Proper installation is crucial for optimal performance. Follow these general steps:
- Mount the Outdoor Antenna: Select a location on your RV or vehicle that is as high as possible and free from obstructions. Use the provided mounting brackets (roof, pole, or ladder) to securely attach the outdoor antenna. Ensure the antenna is positioned vertically.

Image 4.1: KING Extend Pro Outdoor Antenna. This image shows the white cylindrical outdoor antenna, designed for external mounting.
- Route the Outdoor Antenna Cable: Carefully route the coaxial cable from the outdoor antenna into the interior of your vehicle, avoiding kinks or sharp bends. Seal any entry points to prevent water intrusion.
- Mount the Indoor Antenna: Position the indoor antenna inside your vehicle, ideally in the area where you need the most signal improvement. Ensure there is a significant vertical and horizontal separation (at least 20 feet recommended) between the indoor and outdoor antennas to prevent feedback.
- Connect the Booster Unit: Connect the outdoor antenna cable to the port labeled 'Outdoor' or 'External Antenna' on the KING Extend Pro booster unit. Connect the indoor antenna cable to the port labeled 'Indoor' or 'Internal Antenna'.

Image 4.2: KING Extend Pro Booster Unit. This image displays the main booster unit with its orange heat sink fins and connection ports.

Image 4.3: KING Extend Pro Indoor Antenna. This image shows the black rectangular indoor antenna, designed for internal placement.
- Connect Power: Plug the AC/DC power supply into the booster unit and then into a suitable power outlet. The booster will power on automatically.
5. Operation
Once powered on, the KING Extend Pro booster will begin to amplify the cellular signal. Observe the indicator lights on the booster unit. A green light typically indicates proper operation and a stable connection. If the light is red or flashing, refer to the Troubleshooting section.
For optimal performance, ensure your cellular device is within the coverage area of the indoor antenna. The booster works by creating a localized enhanced signal zone.
6. Maintenance
The KING Extend Pro requires minimal maintenance:
- Cleaning: Wipe the booster unit and antennas with a soft, dry cloth. Do not use liquid cleaners or solvents.
- Cable Inspection: Periodically check all coaxial cables for damage, wear, or loose connections.
- Antenna Placement: Ensure outdoor antenna remains free of obstructions (e.g., snow, debris) for best signal reception.
7. Troubleshooting
If you experience issues with your KING Extend Pro, consult the following:
- No Signal Improvement:
- Verify all cable connections are secure.
- Ensure adequate separation between the indoor and outdoor antennas. Insufficient separation can cause oscillation, reducing performance.
- Check the outdoor antenna's position for obstructions and ensure it has a clear line of sight to the nearest cell tower.
- Confirm the booster unit is powered on and indicator lights are green.
- Red or Flashing Indicator Light:
- A red or flashing light often indicates oscillation (feedback) between the antennas. Increase the separation distance between the indoor and outdoor antennas.
- Ensure the outdoor antenna is pointing away from the indoor antenna.
- Power cycle the booster unit by unplugging and re-plugging the power supply.
- Power Issues:
- Ensure the power supply is securely connected to both the booster and a working power outlet.
- Test the power outlet with another device.
8. Specifications
| Feature | Detail |
|---|---|
| Model | KX2000 |
| Brand | KING |
| Item Weight | 1 pound |
| Product Dimensions | 10.62 x 10.25 x 7.25 inches |
| Wireless Communication Standard | Radio Frequency |
| Supported Networks | 5G Ready, 4G, 3G LTE |
| Supported Carriers | All U.S. Cellular Carriers |
| Special Features | Includes roof, pole, and ladder-mounting brackets, outdoor antenna with cable, indoor antenna with cable, and AC/DC power supply |
9. Warranty and Support
For warranty information or technical assistance, please contact KING customer support. Refer to the product packaging or the official KING website for the most current contact details and warranty terms.
It is recommended to register your product to receive updates and support.





