A form of RF used to connect wireless CCTV systems between buildings and across campuses is _____.

Microwave communication is a form of radio frequency (RF) technology that is particularly effective for connecting wireless CCTV systems over longer distances, such as between buildings and across campuses. Microwave links operate within a certain frequency range, often taking advantage of the propagation characteristics of microwave signals to transmit video data wirelessly. This makes them ideal for applications requiring line-of-sight communication, allowing multiple signals to be transmitted without interference from physical obstacles like walls or trees.

In contrast, coaxial cable is a wired solution, which does not fit the description of a wireless connection. Wi-Fi, while also a wireless technology, generally operates over shorter distances and can be subject to interference and bandwidth limitations, making it less suitable for extensive campus connections. Fiber optic cables, although excellent for high-speed data transmission, are again a wired solution and do not represent a wireless method of connecting CCTV systems. Thus, the effectiveness of microwave communication in meeting the requirements of long-distance wireless connectivity specifically identifies it as the correct answer.