Wireless Equipment
In some senses wireless equipment is probably the simplest to buy but also some of the most problematic to operate successfully. A little thought when purchasing will vastly improve things.
Channels
Like a radio controlled car, each wireless item needs its own channel. So if you think you might eventually have say 6 wireless devices then you need to start buying equipment that has that many available (simple systems are usually 4).
One Manufacturer, one range
However don't assume that 6 channels from one manufacturer means you can use it with a 6 channel from another, or even across product ranges. Stick to a range of products, ideally relatively new so you can buy extra products later without them going out of production.
Distance
Don't worry too much about any claims regarding distance covered. Presuming it states at least 50m you will be fine as it will almost always be unobstructed line-of-sight. At the very worst you can stick the receiver on stage and send the signal down a snake.
Tie-Clip / Lapel Mics
