It's not often we are able to offer you a new as well as "better" product from a world leader, but here's one - Sennheiser SKP 300 G3 XLR plug-in Transmitter.

Flexibility is the outstanding feature of this plug-on transmitter that turns every wired microphone into a freely mobile wireless one. Thanks to its phantom powering the SKP 300 G3 can be used with both condenser and dynamic microphones. With up to 24 parallel frequency banks, switchable transmission power, wireless synchronization via infrared and, last but not least, its sturdy metal housing the SKP 300 G3 is fit for the demanding professional routine. And a crystal-clear sound is provided by the HDX compander. Compatible with Sennheiser EK G3 series receivers.

It's well priced too at £295 + vat.