Does your WiFi device have a removable antenna?
Most removable antennas have a twist off base. If you cannot easily remove your current antenna then it may not be possible to upgrade.
What type of antenna connector does your current WiFi device have?
By removing the current antenna from your WiFi device, you should be able to compare your connection type with the pictures below. When ordering a replacement antenna, be sure to choose an antenna with the same connection type to match your WiFi device.