The XMpcr module has only inputs and outputs along with a power light (not even a switch since it's powered via usb). I highly suggest you get the Toslink (optical audio) version if you plan on feeding it through a higher quality sound system. It has much better high frequency response.
The original antenna is about the size of a pack of cigarettes. I got a mini antenna (about the size of a couple of pats of butter) and it works great.