A:AnswerThe antenna is the Built-In Bluetooth Wireless Receiver that assists you to receive music from any Bluetooth enabled device such as a smartphone, tablet, PC, or MAC.
A:AnswerDon't see why not. It has an AUX input so I imagine Chromecast Audio will work. Having the chromecast connected would basically give you the additional option of using WiFi along with Bluetooth. The Chromecast function would arguably be better being that your phone would no longer need to be nearby. I have hooked up a Chromecast to various speakers and systems with success, including a portable Anker Bluetooth Speaker.
