You can do more. Turn off broacast SSID, turn off DHCP, apply a MAC filter to accept only MAC addresses from devices you have authorized, employ WPA2 with AES crypto. Internal directional antennas to keep your Wi-Fi signal on your own property also helps. A filtered range of IP addresses associated with specific MAC addresses can ward off the clown who tries to clone the MAC address of one of your authorized devices.
Yes, those are good if you really want to be secure.
The point of this thread is “is it tresspass or is it invitation?”, and cultural norms dictate that a “we’re open!” sign invites entry, while an unmarked door with a lock (even if unlocked) indicates “stay out”.