Just getting back to this now that I have my 5300 installed.
I bought it with an extra antenna and installed it right behind my dell logo at the bottom of my screen. Works GREAT! I get so many more wireless networks that I didn't get before at my house. The range has increased big time. Def worth the $17 I spent on ebay. The upgrade was pretty tough as I had to tear my 11z down to basically just parts (it looked sad). With teh service manual though, it was really easy. Definitely easier than most HP laptops I've taken apart.