The New Zealand Post Office engineering division (radio) built and maintained a microwave communications facility near the top of Kaimai range, close to the Hamilton–Tauranga highway saddle. In the 1960s it was a Lenkurt relay as part of the national network, linking Sanitorium Hill near Cambridge to Rotorua, with a spur to Tauranga. It now has cell phone and various other radio communications facilities, and is owned and operated by Telecom New Zealand.