The RediGate with cellular modem requires an external cellular antenna. The antenna should be chosen with the correct frequency band, connector, cable length, and appropriate mounting type.
In the United States, the antenna should support the 850 MHz and 1900 MHz frequency bands. In other countries, check to make sure what GSM frequencies are used in order to select the correct antenna.
The antenna cellular connector requires an antenna with a standard male SMA plug and 50 ohm cable, with a minimum cable length of 20 cm and maximum gain (including cable loss) as follows:
Installing SIM Card