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TYPICAL LINE AMPLIFIER IN-BUILDING INSTALLATION

Outdoor Antenna

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Cable

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Uniden Cellular 
Booster

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Indoor Antenna

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Line Amplifier

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LINE-AMPLIFIER INITIAL SETUP INSTALLATION & ASSEMBLY

During this process, you will connect the outdoor antenna, interior distribution antenna 

and a Uniden Cellular cellular booster to the Uniden UL20 Line Amp as follows:

OUTDOOR SIGNAL ANTENNA

Place the outdoor antenna on the roof or peak of the building.  Ideally, this antenna 

should be placed high enough to ensure there are no physical obstacles directly in 

its line of sight. Connect the outdoor antenna to the 50-ohm N-Type coaxial cable 

and run the cable down to the Uniden cellular booster on the connection labeled 

Outdoor

.

INTERIOR DISTRIBUTION ANTENNA

Identify an appropriate and centralized location for the interior antenna in the area 

where you would like to improve the signal. Connect one end of the indoor cable 

to the interior antenna and run the other end of the cable to the Uniden UL20 on 

the connection labeled

 

Outdoor. If a splitter is required in the installation, it can be 

connected on the cable run between the UL20 and the interior antenna.

CONNECTING THE UL20 TO THE UNIDEN CELLULAR BOOSTER

Run a cable from the connection labeled Indoor on the Uniden UL20 to the 

connection labeled 

Indoor

 on the Uniden cellular booster. It’s important to try to 

always maintain at least 15 to 20 feet of vertical separation space between the 

indoor and outdoor antenna at all times to avoid oscillation and feedback. 

UNIDEN CELLULAR BOOSTER PLACEMENT

You should place the cellular booster in an easily accessible, cool and well ventilated 

location within the building. DO NOT keep the cellular booster in a location that is 

continuously exposed to sunlight as it can overheat.

COMMISSIONING THE SYSTEM

Once everything has been connected and plugged in, you will need to switch ON 

the power for the Uniden UL20 by pushing the power switch to the ON position. 

Doing so will cause the 

Power LED

 light on the backside of the unit to remain lit 

indicating the unit is properly powered.

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The                trademark is owned by

                

America Corporation and its affiliates is used under license by Signifi Mobile.

TECHNICAL SUPPORT 

CONTACT INFORMATION

Live Help: unidencellularbooster.com

Email: [email protected]

Toll Free: 1-800-215-7015

2 year warranty against manufacturing defects.
Does not include misuse or customer damage.

Original Bill of Sale is required for all warranty claims

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Explanation of LED Light Indicators located on the rear of the unit

On the backside of the unit there are three LED lights labeled: 

Alarm High, Power

 

and 

Alarm 

Low.

 

When the unit is plugged in, the

 

LED Power

 light should be a solid green color.

Orange LED alarm lights 

indicate the Line Amplifier is automatically adjusting the gain. In 

which case, the Line Amplifier is functional.

Red LED alarm lights 

indicate oscillation (feedback) is severe and additional distance 

between the indoor and outdoor antenna is required. If the LED light(s) continuously stay 

red, the Uniden UL20’s Automatic Gain Control will attenuate the signal strength in order 

to stop the Line Amplifier from oscillating.

Green LED alarm lights

 indicate the Line Amplifier is functioning properly.

* Three solid green lights indicate the Line Amplifier is functioning properly. 

N Type Male Connector

 

(50 Ohm)

LED Alarm Indicator

Power Input 9V

OFF/ON Switch

Heat Sink

LED Power 

Indicator

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