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Hello, Yes, RUT240 will work with one antenna but it is recommend to use both antenna to have the best cellular reception. For more information you can visit this link: https://wiki.teltonika-networks.com/view/Mobile_Main_and_AUX_Antennas And for the information where is the main antenna you can refer to this link: https://wiki.teltonika-networks.com/view/Where_are_MAIN_and_AUX_LTE_antenna_connectors_on_RUT9XX_and_RUT240%3F Hope it helps Regards, Jerome