For IEM systems, getting a good signal to the bodypack receiver is essential. One barrier to great reception is that many belt-pack receivers don’t support diversity reception–which is to say they have only a single antenna. This makes these receivers much more likely to encounter dropouts and multi-path fades than the dual antenna diversity systems common in microphones and higher end IEMs. The belt-pack is also in motion, and can change orientation depending on body position. Plus, the pack sits beside or behind the talent, requiring the signal to pass through or alongside the performer’s body, which is nontransparent for RF energy.