Mouse over for menu items
Call us at 1-800-238-2811 for antennas or repeaters
Tutorial Section about improving reception
Learn how to improve and boost Verizon, AT&T, Cingular and Sprint/Nextel reception here in our learning center - tutorial

Repeater Tutorial
What you need to know before buying a Repeater System

Repeater Section


Basic Installation

Donor Antennas

Coverage Antennas

Other Issues


Repeater FAQ's

Antenna Section



Bands and


Home and


Pointing an

Finding Your

Frequently Asked

The correct application of a repeater system is to take existing good signal from outside a building, amplfiy it and bring it inside where reception needs to be improved. However, there are a few things to know before you purchase a repeater system. A properly applied system will bring signal to the areas you want--an improperly applied system will give disappointing results. Please read over the following information to learn how a repeater system can help for your application. This tutorial will provide you with most of the information you will need to purchase a repeater system

In some situations a repeater system will not work regardless the marketing hype you may read elsewhere on the internet. We would rather give you realistic expectations up front rather than sell you something that would not have worked in the first place. At the very least, please read this first page of our tutorial. If after reading you still have questions, please feel free to call us to discuss your particular situation. Call us toll free at 1(800) 238-2811

You MUST have Minimum Signal Levels - IMPORTANT!!

You must have a minumum amount of signal present outside where you would install the Donor antenna. Failure to provide the repeater system sufficient signal will only result in a poorly performing system or will have absolutely no increase in reception inside the building. This is the number one consideration for a repeater system! A weak outside signal will result in a smaller area covered inside. A repeater cannot make signal appear outside when their is none. A repeater also cannot make a weak signal outside stronger. Although a marginal signal MAY be enhanced to provide enough signal to drive a repeater. (please call us for details if this fits your situation)

How to check your signal levels:

To check your signal levels, take the phone outside (preferrably on the roof) and observe the signal bars on the phone. It is also helpful to be on a call for immediate registration of the signal/reception. Carefully walk around the roof with the phone to see where the signal is best. The Donor (outside) antenna should be placed in the location where you get the most signal. Note: Placing the phone in test mode is NOT necessary. We have actually had better success simply observing the signal bar indicators on the phone.

A signal level outside of 50% or better is required for all CS and SR series repeaters. A signal level of 65% to 75% or better is required for the DA series repeaters. (3+ bars CS and SR series - 4+ bars DA series)

It is important to investigate and understand what is causing your reception difficulties. If your building is made of concrete, steel, steel roof, copper roof, brick, aluminum siding, concrete roofing tiles, metal roofing tiles or any other signal stopping material, a repeater is usually the ideal solution for your situation. Signal outside is 3-5 bars and falls off when you enter the building. This is an indicator that the building is the problem and a repeater system will usually solve that problem by bringing that reception from the outside to cover the inside of your building.

If your building is on the fringe of the cell site's coverage area and the signal is poor everywhere outside your building, a repeater system WILL NOT work for you. A minimum amount of signal is required in order to drive a repeater system. Repeater systems are not magical devices, they cannot merely create signal from little or nothing. If you are in this situation, you will want to investigate an external antenna directly connected to your phone or use a cellsocket device and external antenna if you have a compatible phone. Go here for all of the options available to you. You are always welcome to call us for further options for your situation.

Next Page - Basic Installation Instructions

Basic Installation Instructions

Donor Antenna Patterns

Interior Layouts and Coverage Antennas to use

Other issues regarding repeater systems

Repeater System Differences - Which System to choose

Cellular PCS GSM antennas, repeaters, amplifiers, connectors and adapters
We gladly accept Visa, Mastercard, American Express and Discover. Our members only section

This Site Copyright 1996-2011 Criterion Cellular. All Rights Reserved. Some logos and graphics used are trademarks of their respective owners. Prices subject to change without notice. Not responsible for typographical or photographical errors. Some products may not be available in all areas. All prices are in US dollars. We reserve the right to modify product pricing and/or specifications without prior notice. We do not sell or rent our customer information - Privacy Notice. Site questions / comments / problems mail to Webmaster

Warehouse Locations throughout the US







Car Kits

2.4 - 5.8 GHz



Learning Center

Criterion Cellular antennas, Cingular repeaters, amplifiers, Verizon boosters, adapters, cables and signal extenders for Sprint Nextel

Verizon, AT&T, Nextel & Sprint Reception Experts Since 1990

Click Here to Checkout View Cart Contents - Click Here
Comodo SSL Certificate



What's New








Glass Mount Antennas


Magnetic Mount Antennas


Panel Antennas


Omni Ceiling Mount Antennas


Yagi Antennas


1900MHz Grid Antenna High (18dBi)


1900MHz Grid Antenna Ultra (24dBi)


Nextel Antennas




Cellular, PCS, Dual Band Amplifiers


Amplifier Installation Help




Mobile Repeater


Main Page - Index


Audiovox (UT Starcom)






















Novatel (Merlin)


Palm (Handspring)












Sierra Wireless


UT Starcom






Connector Adapters




Repeater Main Page-INDEX




--- SMALL REPEATERS 1,000-5,000 Sq. Ft. ---


Spotwave Mini Repeater System 1900MHz


CM - Dual Band Repeater - Home Office (850-1900MHz)


DA - Dual Band Repeater -Small Office (850-1900MHz)




--- MEDIUM 30-50,000 Sq. Ft. ---


CM - PCS GSM Repeater 1900MHz


CM - Cellular Repeater 850MHz


CM - Dual Band Repeater (850-1900MHz)


CM - Nextel iDEN Repeater




--- X-LARGE 50-75,000 Sq. Ft. ---


C6 - PCS GSM Repeater 1900MHz


C6 - Cellular Repeater 850MHz


C6 - Nextel iDEN Repeater


C6 - Dual Band Repeater (850-1900MHz)






Custom & Larger Repeater Systems






Repeater Upgrades - AddOn Antennas


Lightning Protection






Mobile Repeater


Repeater Tutorial


Handsfree Car Kits




2.4-5.8 GHz Panel Antennas


2.4 GHZ Grid Antennas


Splitters/Power Dividers


Directional Couplers


Lightning Protection


Bulk Coax Cable


Connectors for Coax Cable


Tools for Coax




Pre-Made Cables


About Us


Contact Us


Site Map




Privacy Policy




Return Policy




Ordering Options




Site Help






Repeater Tutorial - Start Here




Before You Buy - PLEASE READ


Installation Instructions


Antenna Patterns


Interior Spaces


Repeater Issues


Repeater Differences






Start Here


Reception Basics


Bands & Frequencies


What's Gain


Determining Frequency


For your Home


For your Car