The proliferation of mobile phones is great, and so is the availability of 4G in the UK. However, dwindling spectrum available for wireless audio gear could cause problems at your local music venue or playhouse -- especially in the UK. Shure, the pro audio company, wants a dedicated radio spectrum for wireless microphones, in-ear monitors and other tech. As the company puts it, the best area for the audio gadgets to work is UHF bands IV and V or 470 – 854MHz. In the UK specifically, the 800MHz band has been approved for use by 4G networks and 700MHz is next. Those bands were made available after television service switched from analog to digital a few years back.