License Free Channel 70 UHF Wireless Microphones

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UHF TV Ch 70 – 863.000 to 865.000 MHz
Channel 70 is used by devices such as wireless microphones, IEMs and wireless headphones along with other devices and remains free to use throughout the UK and EU

It is possible to get 4 working wireless microphone systems in the deregulated CH 70 band – as an example here is a set of 4 usable frequencies between 863.000MHz and 865.000MHz that have been tested for (their lack of) intermodulation and are recommended by Sennheiser:

Mic 1 863.100 MHz
Mic 2 863.500 MHz
Mic 3 864.300 MHz
Mic 4 864.900 MHz