The modem antennas work with the AER, ARC, and COR models that include an integrated modem. Some antennas may not be optimized for all frequency bands for a particular model (see individual antenna specifications). In some cases, a single antenna connected to the main (primary) antenna port will provide sufficient gain. To see “true” 4G speeds on LTE, or better performance, use two external antennas. For example, two antennas may provide 15 Mbps throughput and one antenna may only provide 8 Mbps throughput.