I don't think we should have a helipad in a residential area because
You can access the police station in Algonquin area and go upstairs to the helipad. And have a immigration authority annihilator helicopter spawned on the helipad. And it is in one of the cut scenes
16 meters
residential zone means houses in an area
The area of West DeLand Residential District is 4,046,856.4224 square meters.
The area of Southeast Gainesville Residential District is 1,355,696.901504 square meters.
The area of Interlaken Historic Residential District is 121,405.692672 square meters.
The area of Sanford Residential Historic District is 10.117 square kilometers.
The area of Northeast Gainesville Residential District is 6,717,781.661184 square meters.
The area of Harbor Oaks Residential District is 1,618,742.56896 square meters.
The area of Punta Gorda Residential District is 2,023,428.2112 square meters.
A "residential area" means that residents live in the area. Basically, it's a place where houses / living quarters are located.
It will depend on your area but you can check with Verizon to see if they offer residential service in your area.