Those needing an extended indoor antenna for Alarm.com Cellular communicators can turn to the Alarm.com 9AM-18F-MMCX. This is a cellular antenna with an MMCX connector and an 18-foot-long cable. This Alarm.com Cellular Antenna works with both LTE and 3G bands, making it very versatile. The MMCX connector, unlike coax (SMA) connectors, snaps onto the radio, as opposed to being screwed on. Some older 2G communicators use an SMA connector, but newer 2G, 3G, and 4G (LTE) communicators will use the MMCX snap-on connector. At 18 feet, the cable included with this antenna should be long enough to get the antenna into position for the best possible signal. If it is not long enough, then another option should be considered. It is not recommended that you extend the cable length by splicing additional wire into that which is already provided.
