Cellphone-Mate CM248 Indoor Wall Mount High Gain Dual Band Panel In-Building Antenna Brand New Cellphone-Mate CM248 Indoor Wall Mount High Gain Dual Band Panel In-Building Antenna. The Cellphone-Mate Panel antenna with built in ground plane is designed for wall mounting inside of buildings when used with wireless amplifiers. The Cellphone-Mate panel antenna works with all North American cellular providers and comes with an N female connector (Requires Coax Cable - SOLD separately). Applications: Indoor systems, GSM/CDMA/3G/WLAN systems, 800~2500MHz Broadband working. Wall Mount Indoor Use, Lightweight ABS Radome, Compact Size, Low Profile.