Connecting older tv to dvd/vhs and hd set top box

Question

My tv has only an antenna in, video in and audio in on the rear and I have had my dvd/vhs connected no worries. The thing is now I want to connect a HD Set Top Box and am not sure of how to go about it. Any ideas. Ideally I would like them to be all through the one connection, I can use the set top box through video 2 [side panel] but this is not ideal