Lenovo ThinkPad X300 Series User Manual page 8

Location of the UltraConnect wireless antennas
ThinkPad® models feature an integrated diversity antenna system built into the display for optimal reception, enabling wireless communication
wherever you are.
The following shows the location of each built-in wireless antenna.
1. Wireless LAN and WiMAX combo antenna (Main)
The main antenna for the wireless LAN or WiMAX feature is located at the top left corner of the computer display.
2. Wireless WAN antenna
If your computer comes with a wireless WAN feature, its transmitter antenna is located at the top left portion of the computer display, next to the
wireless LAN main antenna.
3. Wireless LAN antenna (Third)
If your computer has the Multiple Input Multiple Output (MIMO) wireless LAN feature, the third wireless antenna is located at the top left portion of the
computer display, near the center.
4. Wireless USB antenna
If your computer comes with a wireless USB feature, the antenna is located at the top right portion of the computer display, near the center.
5. Wireless LAN and WiMAX combo antenna (Auxiliary)
The auxiliary antenna for the wireless LAN or WiMAX feature is located at the top right corner of the computer display.