Additional hardware that does not come with any HD receiver, you have to purchase it separately and install it if you wanna watch DN HD channels. Here is how it looks like, this one is for VS9000HD, but they all look similar, and they are pricey:
For a list of all the HD channels available check out this link:
HD - LyngSat HD
Here is North America we can only get the birds within the 61.5W to 148W range, so ignore the rest.
