I live on the second floor, and the antenna is located 10 meters away from the front of the balcony, facing the opposite building. I can easily receive signals from repeaters several kilometers away.
It doesn't seem to be able to reach full power with 5W, but it can reach some level with 10W, although the signal report only shows a value of 4.
Each time, I would climb to the top floor of the building in the complex to establish a connection.
I'm wondering if I could improve my signal by using a Yagi antenna or a high-gain GP antenna, but I don't know if it will work.