How did the mountains in Hawaii affect the radar at Pearl Harbor?

Okay so I’m guessing your talking about the attack on the Pearl Harbor that took place in ww11 by Japan I believe it was.
Background info:
Japan was mad at the lack of oil and new deal that they were promised but never received. So they attacked Hawaii (Pearl Harbor) And at the time, the U.S didn’t have time to worry about that because they were already dealing with Hitler and his army.

Answer/explanation:
The mountains however, were blocking the radio waves from the radar. Therefore, preventing any signals of any attacks that were to come. The mountains also work heavily with gravity. (Because The higher the mountain the stronger the gravity is in that area) Meaning that since the force of gravity was messing with the radio signal waves, preventing any signals that the radar could detect

Hope this helped <3 Yw!