Setup of HD Satellite in 2012 Flying Cloud

I have a 2012 25' FC FB and have been using a standard definition Direct TV setup. I only have one 75 ohm cable port on the outside and a 75 ohm cable connection under the dinette at the rear which feeds up to the blue-ray player and the hdmi cables for both TV's. I would like to use a HD system to be able to access the local ABC, CBS, NBC, etc stations around the country where many are only broadcasting in HD. My question is how to modify my current setup to allow for a HDMI connection from the HD satellite instead of the current 75 ohm cable connection? I know this was a wordy post! Thank's in advance for any suggestions/solutions that come to mind.