Powershell background tasks

how do I do a background task in Powershell?

$ ant >/dev/null &        #cygwin

The closest I can get to this in Powershell is

ps2> start-job {ant |out-null; `a}   #powershell

but then I don't get output in real-time, nor do I get the beep. I have to poll for it with receive-job and get the beep when stdout gets polled.