SureCall TriFlex

by SureCall

The TriFlex is a bidirectional booster that enhances cellular signals for multi-carrier 2G-3G service as well as carrier-specific 4G service for AT&T, Verizon and T-Mobile.


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Product description

The SureCall TriFlex Signal Booster Kit is a tri-band wireless signal booster. It supports Voice and 3G for all carriers, and 4G for a single carrier, depending on the model chosen.

It covers an area of up to 6,000 square feet, 5 to 10 simultaneous users and includes a 3-year warranty.

All carrier frequencies are independently balanced with easy to use adjustable control dials. The SureCall TriFlex is approved by all major carriers and equipped with built in safeguards to completely eliminate interference to cell towers.


  • Highest 4G data rate in the industry
  • 65 dB cellular, 72dB PCS, 63.5 dB LTE
  • Fully compliant with new FCC certification standards
  • Auto Gain Control (AGC) and manually adjustable dB gain and attenuation
  • Dual Embedded CPU
  • Eight RSSI detectors for all inputs and outputs
  • Configurable for all indoor environments

Amplifier Options

The SureCall TriFlex cellular booster kit can be customised with several different amplifier and antenna options:

The TriFlex-A Amplifier boosts most major 2G and 3G carriers plus the AT&T & US Cellular 4G LTE networks.

The TriFlex-V Amplifier boosts most major 2G and 3G carriers plus the Verizon 4G LTE network.

The TriFlex-T Amplifier boosts most major 2G and 3G carriers plus T-Mobile's 4G and 4G LTE networks, MetroPCS 3G and 4G, Cricket, and the 4 main Canadian Carrier LTE networks from Bell, Rogers, MTS, and Telus.

Outside Antenna

The TriFlex kit also comes with a choice of two outside antennas:

The SC-288W Omni Outdoor Antenna has 4dB gain. Omni antennas receive and send signals in a 360º radius. They can receive signals from multiple cell towers and is best for boosting signal on many different carriers. They are excellent in most situations where the existing outside signal strength is moderate to strong. If the outside signal is weaker than that, you may need the directional yagi antenna instead. We have a guide to testing your outside signal strength here.

The SC-230W-S Yagi Outdoor Antenna has up to 8dB of gain. It is a directional antenna that can reach cell towers up to 30 miles away. It needs to be set up pointing in the direction of the cell tower, and because it is directional it will only pick up signal in that direction. It’s very powerful at picking up weak signal in one particular direction, and we recommend it for situations where existing outside signal is weak, and you only want to boost coverage for one carrier (or if more than one carrier has a cell tower in that direction). If you need to boost signal coming from different directions, it is possible to set up more than one yagi antenna. Contact us for more help with this.

Inside Antenna 

Finally, the TriFlex kit also has a choice of two inside antennas:

The SC-222W Omni Dome Antenna is a multi-band omni-directional plastic dome antenna with that gathers signals from all sides. It has 6dB gain and is designed for central locations with 360º coverage. The range of the antenna is dependent on three factors: 1) physical obstructions, 2) power generated by the booster and 3) reception from outside signal received and distributed by the outside antenna. Besides the antenna itself, parts include mounting equipment. It needs to be mounted to the ceiling for best results and you will need to run a cable to the back of the ceiling.

The SC-248W Panel Antenna is a directional antenna with up to 10dB gain. Panel antennas allow optimum reception to targeted areas. It can be mounted to either the wall or ceiling.

Antenna Separation 

The SureCall TriFlex repeater has a powerful 72 dB gain. Because this is a powerful amplifier, you must have a minimum of 20 ft of vertical separation between the inside and outside antennas. Adding up to 75 feet of horizontal separation will help improve the performance of the kit by minimizing the potential for oscillation (feedback) between the inside and outside antennas.

Kit Contents

  • SureCall TriFlex Amplifier
  • SureCall Omni Directional Outside Antenna SC-288W OR Yagi Directional Outside Antenna SC-230W
  • SureCall Dome Antenna SC-222W OR SureCall Panel Antenna SC-248W
  • 1x30ft. SureCall Ultra Low-Loss CM400 Coax Cable SC-400-30NN
  • 1x75ft. SureCall Ultra Low-Loss CM400 Coax Cable SC-400-75NN

Lightning Surge Protector

We recommend using a lightning surge protector in most cases, but particularly if you'll be installing the kit in an area with frequent lightning. The lightning surge protector should be installed in line with the cable and near the amplifier, and should be properly grounded.

How it works

how a cell phone booster works
1 - Outdoor antenna

The outdoor antenna receives and transmits signal to nearby cellphone towers. Outdoor antennas can be either directional or omni-directional.

2 - Cellular amplifier

The amplifier (or "repeater") boosts the signal coming and from and going to the cell phone tower. The "gain" of the amplifier describes how strong the amplification is - you'll see that word scattered across our product pages.

3 - Indoor antenna

The indoor antenna rebroadcasts the signal inside the building. Some kits have more than one indoor antenna to help distribute the signal.


The coverage area you can expect from any signal booster kit depends on the signal strength outside the building.

Outdoor Signal Estimated coverage area
Strong outdoor signal (5 bars) up to 6,000 sq. ft. coverage
Medium outdoor signal (3-4 bars) up to 4,000 sq. ft. coverage
Weak outdoor signal (1-2 bars) up to 2,500 sq. ft. coverage
Note on Yagi antenna:

If you use a yagi outdoor antenna, you can expect a 1.5x greater coverage area. However, you should expect to only improve coverage for one network. Read more about outdoor antennas here.


Frequency: 3G All Carriers + AT&T 4G LTE
Supported frequency bands (MHz): 698-716 / 728-746 / 824-849 / 869-894 /1850-1910 /1930-1990
Carrier Supported services Unsupported services
Verizon 2G Voice 3G Data 4G LTE
AT&T 2G Voice 3G Data 4G HSPA+ 4G LTE
Sprint 2G Voice 3G Data 4G LTE
T-Mobile 3G Data 4G HSPA+ 2G Voice 4G LTE
Frequency: 3G All Carriers + Verizon 4G LTE
Supported frequency bands (MHz): 746-757 / 776-787 / 824-849 / 869-894 / 1850-1910 / 1930-1990
Carrier Supported services Unsupported services
Verizon 2G Voice 3G Data 4G LTE
AT&T 2G Voice 3G Data 4G HSPA+ 4G LTE
Sprint 2G Voice 3G Data 4G LTE
T-Mobile 3G Data 4G HSPA+ 2G Voice 4G LTE


Like almost all of our products, the SureCall TriFlex can be installed by anyone who feels comfortable doing simple home repairs and running cabling. If you’re not comfortable doing that kind of work, you might consider finding a local electronics installer or asking a friend.

Unlimited free technical support:

Anytime you purchase from RepeaterStore, you get unlimited free technical support from our signal experts. Whether it’s installing a kit or troubleshooting a problem, we’re here. In over 7 years of being in business we’ve helped over 20,000 customers insall kits and improve their signal.

Have a question now? Call us from 8am to 5pm PST: 1-800-761-3041.

Product video


UPC 0856019003620 (SC-TriAH/O-72-OD-KIT)
856019003637 (SC-TriAH/O-72-OP-KIT)
856019003644 (SC-TriAH/O-72-YD-KIT)
856019003651 (SC-TriAH/O-72-YP-KIT)
856019003668 (SC-TriVH/O-72-OD-KIT)
856019003675 (SC-TriVH/O-72-OP-KIT)
856019003682 (SC-TriVH/O-72-YD-KIT)
856019003699 (SC-TriVH/O-72-YP-KIT)
Weight 3.5 lb
Dimensions 9.3" x 6.3" x 1.4"
Frequency 698-716 / 728-746 / 824-849 / 869-894 /1850-1910 /1930-1990 (SC-TriAH/O-72-OD-KIT)
746-757 / 776-787 / 824-849 / 869-894 / 1850-1910 / 1930-1990 (SC-TriVH/O-72-OD-KIT)
Gain 65dB - Cellular / 72dB - PCS / 63.5dB - LTE (SC-TriAH/O-72-OD-KIT)
65dB - Cellular / 72dB - PCS / 64.3dB - LTE (SC-TriVH/O-72-OD-KIT)
Impedance 50 Ohm
Noise 5dB
Output power 1 Watt EIRP
Power supply AC 100-240V, 50-60Hz.
Coverage 2500 sq ft (1 coverage with weak signal)
4000 sq ft (2 coverage with medium signal)
6000 sq ft (3 coverage with strong signal)

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