I get that its xm/sirius ready but what about the HD Radio feature? Can this play HD Radio stations?

http://www.bargainunlimited.com/servlet/Detail?no=207

http://www.amazon.com/JVC-KD-AVX2-dash-receiver-screen/dp/accessories/B000EU69W4

It is not HD capable and after looking at the JVC web page it doesn't mention being HD capable with an external tuner.