A signal booster antenna is typically either a directional or omnidirectional antenna connected to the signal booster with a coaxial cable. They attach to the network unit with a male connector or female connector. Sometimes the unit's built-in antenna is not strong enough to secure enough signal. In this case, you can use an antenna to strengthen the signal going into the booster unit. When the antenna is connected, it will amplify the 3G, 4G, LTE or 5G cellular signal, allowing the signal booster to boost the cellular signal. The result? A higher data speed and fewer dropped calls on your mobile phone!