VHF systems usually work very well if a small amount of care is taken when selecting frequencies. There are times, however, where UHF operation is preferable. These include situations where there are many existing VHF systems present, where certain types of interference are troublesome, and a few others. For more information, see UHF Versus VHF . For more information, see Diversity Versus Non-diversity .
Wireless systems are available with body-pack or handheld transmitters.
Handheld transmitters include both the microphone element and the radio transmitter in one package and are similar in appearance to wired vocal microphones. Body-pack transmitters are housed in thin, flat packages and have a connector to attach an external microphone. Handheld transmitters are usually the best choice for vocal performances, live interviews and situations where the transmitter is passed from person to person. Body-pack transmitters are appropriate for most other applications. Many types of microphones, including several specialized types, are available for use with body-pack transmitters.