How to tell if my Direct TV Slimline dish is 3LNB or 5LNB?

I need to figure whether my Direct TV Slimline dish is a 3LNB or 5LNB. Its oval shaped, larger than a regular dish on the sides, with three "prongs" rather than the traditional 1 prong and the word Slimline scribbled over the center





Thank you in advance|||"Count" them?|||Count the horns.





This is the 3 LNB:


http://www.solidsignal.com/pview.asp?mc=鈥?/a>





Here is the 5 LNB:


http://www.solidsignal.com/pview.asp?mc=鈥?/a>