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Sierra Wireless Airlink LS300 Gateway
The Sierra Wireless Airlink LS300 is used on AT&T Networks for 3G and 4G HSDPG.
You can improve the cellular signal to the LS300 by connecting an external antenna to it or by using a powered signal booster.
LS300 Antenna Connectors
The LS300 has SMA Female antenna connectors. You can connect an external antenna or Direct Connect type power booster to it (see options below).