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Do I need to use an external antenna with Cel-Fi?

No.  Cel-Fi’s internal antenna array was designed to be much more sensitive than a handset, and it has extremely high gain.  This is why an external antenna is very rarely necessary, and partly why Cel-Fi is so easy to install quickly and without the need to run wires and install antennas that can all amount to added costs and hassles for a result that is uncertain.
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