Wired systems yield the most dependable systems. The systems designer has many options to deliver signal, coax, UTP, fiber and so on. One has to remember wireless sounds great but you still have to power the devices and if you can get power to them you may also run cable as well. Currently, analog CCTV has only two frequencies allotted by the FCC 2.4Mgz and 5.8Mgz, neither of which require a license. The pit falls are many. If your neighbor puts up a 2.4Mgz system next to your already running 2.4Mgz it may take you down and there is nothing you can do about it. Microwave appliances and the like also wreak havoc on these systems as well.