Combining OTA with Cable

[jere925]

I bit of a complicated question here. I currently have an OTA antenna for HD local channels and want to get cable for ESPN, etc., but the cable is not offered in HD. Is there a way to configure my setup so that I can easily switch between OTA (for HD locals) and Cable. Currently my antenna is hooked to a splitter which is attached to every room in the house. Every room has 2 coax cables in the wall, but I was wondering if there was a way to combine the OTA and cable into one signal since I can only plug 1 coax into my TV at a time. Also, I don't believe that there will be a cable box involved. Thanks for any advice!