I recently bought a Colecovision from eBay that does not have any of the RF adapter stuff. What kinds of connectors and cables should I pick up from Radio Shack to make it work?

I've already purchased an old-style switch-box from there, but one of my friends told me that there was a kind of adapter that also works fine that is much cheaper. I tried using a standard audio cable with the switch-box and my picture came out all garbled and stuff. What kind of cable do I need to get that will work as a Colecovision game cable? Thanks.

- JK