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What is a cellphone signal booster?

A cell phone signal booster is a type of bi-directional amplifier (BDA), as it is commonly named in the wireless telecommunications industry. It is a device used for boosting the cell phone reception to the local area by the usage of a reception antenna, a signal booster and an internal rebroadcast antenna. These are similar to the cellular broadcast towers used for broadcasting by the network providers, but are much smaller, usually intended for use in one building. Modern cellular signal boosters rebroadcast cellular signals inside the building. The systems usually use an external directional or omni-directional antenna to collect the best cellular signal, which is then transmitted to an booster unit which amplifies the signal, and re-transmits it locally, providing significantly improved signal strength.  


One advantage of cell phone repeaters is an increase in the cell phone's battery life due to the lower power required to broadcast the signal to the local bi-directional signal booster, due to its proximity to the phone.

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