I've just bought a Denon 3312, and it looks like I've been mislead by their advertising. I understood that it had built-in wireless for Airplay, but, if it has, I can't get it to work. Airplay works fine if I use a wired connection. The living room doesn't have an ethernet point, and adding one will be tricky. Is there a wireless dongle that'll work with the Denon, and has decent range? I already have a couple of airport expresses set up on other systems in the house, and an iPad running the Remote app.