You need a multi-dish switch, you can't just "split" the feed.

Another choice is to get a 4 output LNB and run more lines to the additional receivers but the switch is the easiest solution.

Something like this:

http://cgi.ebay.com/New-3x4-DirecTV-Satellite-Multiswitch-Mult-Switch_W0QQitemZ120444713234QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item1c0b107912&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1234%7C293%3A1%7C294%3A50

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250