Need Some Help...

[Sandy G]

As you guys may know, I have 3 of those odd little Quasar UP 1315XQ 3.5" color TVs from the mid '80s. These little guys have GREAT pics, but as analog rides off into the sunset, I have a problem-There is apparently NO WAY to hook up an ext antenna to these things-Except thru this attachment called a "VCR Adapter", which only one of my sets has. Its a little box, about the size of a cigarette pack, that had 4 RCA jack looking female inputs, one each for "Video In/Out" & Audio In/Out". My question is, how/where do I get a box that will convert a std cable company signal/coax fitting into something I can use on this ? I'm sure it can be done, I just don't know how to "get there from here". But I'm sure some of you wizards out there will know what to do, & can enlighten me...Muchas Gracias...-Sandy