I use one of these: Netgear - WNCE2001 Universal WiFi Adapter

It can be powered off the USB port of the MC200.

Cheers
Mark

Source: Meridian MC200->MS600->PS Audio DS DAC
Linn Sondek LP12 Radikal Kore/Kuzma Stogi S/Soundsmith 'The Voice'
Phono: PS Audio GCPH
Pre: Wyred4Sound STP SE
Power: Krell FPB200
Speakers: Thiel CS2.7