Victron Energy Outdoor Antenna f/GX LTE 4G-A One Size. It can be used with the GX LTE 4G for 2G 3G and 4G bands. If the 2G/3G variant does not provide sufficient signal quality in an installation the solution is to contact a local GSM antenna provider. All the necessary information including a link to the cellular modem (Simcom) used can be found in this manual. Package Contents: Victron Energy Outdoor Antenna f/GX LTE 4G-A Victron Energy GSM900100400: Outdoor Antenna f/GX LTE 4G-A One Size