Do you mean you currently have the elliptical 2 LNB (PhaseII dish) as opposed to a oval standard single LNB or elliptical 3 LNB (PhaseIII dish)?
YES you need more; 4 from the dish. Also, depending on how many tuners (not # of TVs) will determine the total number of total RG6 runs and what other equipment you might need. - HERE is the install manual for that dish.
ADDED USER GUIDE