HELP!! Centronics ZAT 502 HD Terrestrial Digital ATSC Receiver TV


I just bought this HD receiver and I can not get the HD output from it I have a HD ready TV is there something I'm doing wrong wiring wise or what I thought this would be a plug and play type setup. When I plug my PS3 into my HDMI port on my TV it converts my Screen to 1080i if anyone can help please feel free to advise. this can't be rocket science. just a note I have an HD ANTENNA no cable tv or satelite