Where the meters is installed in a signal dead spot the MC11 SMA booster module will allow an external aerial to be fitted for improved connectivity. Specifically designed for situations where signal reception is compromised due to barriers or challenging environments, this module allows an external aerial to be connected to the SMA port. Comes with 5dBi external antenna. Install by first removing the existing top-hat and fitting the new booster module in the same way. Then screw on the external aerial. This should be located in an area away from the meter with signal reception is improved. All modules come with active network roaming SIM. There is no need to swap the SIM out after fitting.