Hi Jul,
Please advise the complete make & model numbers for all of the equipment involved. Judging from a small photo, the receiver seems a couple of generations old. What exactly are you trying to do?
More details will get you better responses. Thanks.
(By the way, I'm guessing you need to plug the digital antenna into the TV, then use an HDMI ARC Cable from the TV to the Rotel for multichannel sound. However, the Rotel, and maybe the TV, is of such a vintage they don't have HDMI ARC. It that case you've be limited to Optical sound connections.)