Derideal 11 - 03 (Patreon)

The Magnetsphere device can vibrate the air, ionize it and charge the air around it.

making a shield of many of these towers create a "pattern" that make most wireless signals to bouce over and over inside the city, it also work blocking signals outside (a tower alone won't make much, but the combination of many and placed in key parts form a shield capable of this effect)

these electrical charges affect navigation, so it makes a little more difficult to fly over the city space, this effect isn't exactly as strong.

there's a "bright" glow of the city seeing from space, as the charges in the air make it "shine" a bit, confusing the city from the sky with the surrounding clouds which the city is usually sorruounded with, as it's located in a harsh weather point of the planet.

UP1- text fixed, thanks @twilight!