The Hoverpad is a terrain agent that cost 40 Monkey Money. You can place it on City terrain or darkness, and then place towers on top of it.
AC: It looks like a Pontoon with a propeller underneath it.
Uses until pro: 50
This increases the range of the towers on top of it.
The Pro doesn't change the Pontoon like because Pontoon Pro increases the range of towers, and this does the same.