2 Antennas Portable Handheld Anti Tracker GPS L1 L2 Signal Blocker Jammer Mobile Phone Signal Isolator Jammer - China Jammer, GPS Signal Jammer | Made-in-China.com
Special Topics - GPS (5 of 100) Satellite Transmission Signals on L1 and L2 - YouTube
L1 GPS Repeater Assembly (GPSRKL1) – GPS Source
GPS/GLN/L1: 40 dB GPS/Galileo/GLONASS/Beidou L1 Antenna