The 18 inch dish is round, not oval. Anyway, 8 outputs will be enough so a 2x8 or 3x8 multiswitch is what you need. Use one dish and run two cables from the dish to the multiswitch. You will then have up to 8 outputs for the Sat connections to your receivers. http://www.solidsignal.com/prod_display.asp?CAT=Multiswitches&PROD=SP38DC is one example.