Thanks -- I am hoping for something with a length of cable leading to the MCX, however (dongle type). I've seen a few out there. I bought some from China but they came with a different type of coax connector incompatible with F connectors.
I am having the sam problem too..but it may be solved using e-bay. The cables/ connectors may not be exactly what you are looking for but Im pretty confident it can be narrowed down to get what you / we are looking for.
I called Dell about the "missing" adapter and they sent me a bit of a care package, to include a mini-port-to-VGA adapter (a $33 part) and the U252N dongle. Great, now how do I use it? Plugging into the port on the laptop is obvious, but most coaxial cables in this part of the world use F-connectors and they don't fit. Do I need an adapter for my adapter so that I can finally connect the laptop directly to my cable TV service? I'm hoping to record some programs once I get this figured out. You know, that whole Windows 7 "Recorded TV" thingy?