Using this antenna is easy. First, find a good outdoor spot for installation. Make sure it's in a place where it can have a clear line of sight to the signal source. Use the stand holder, cable, and screws provided to mount it on the mounting plate. Connect the antenna to your WiFi router using the cable.
When using, keep in mind that it has an SMA port, so make sure your router is compatible. Also, this antenna is not for radio and TV.
For maintenance, since it's weatherproof, you don't need to worry too much about normal weather conditions. But occasionally check the mounting to ensure it's still firm. If there's a lot of dirt on the antenna, you can gently wipe it clean with a soft cloth.