Indoor 4G Mini Panel Antenna for CLEAR/SPRINT This Indoor Directional Panel Antenna is rated at an estimated 7dbi Gain over the BRS/ISM bands and connects directly to your CLEAR HUB EXPRESS Modem's external antenna port. This antenna's primary function is to boost your modem's internal antenna function to help improve overall CINR/RSSI scores. Indoor Panel 4G Antenna for clear hub express modems