Permaconn 5M Antenna Extension Cable Extension cables available in 3M (EXT3), 5M (5EXT) & 10M (10EXT). When extending: 1. Only extend the 3G input or 4G input, not the WiFi or Auxillary. 2. 4G devices utilise the existing antenna, remove the 4G Antenna & cable from the others. 3. 3G devices use the ANTH3G, a 3dB High-Gain Antenna.